NEW AMERICAN PALEOZOIC OSTRACODA.

Size: px

Start display at page:

Download "NEW AMERICAN PALEOZOIC OSTRACODA."

Phebe Joseph
5 years ago
Views:

1 New American Paleozoic Ostracoda. 179 NEW AMERICAN PALEOZOIC OSTRACODA. BY E. O. ULRICH. No. 1. CTKNOBOLBINA AND KIRKBYA. Since the publication of my paper on " New and Ivittle Known American Paleozoic Ostracoda," in Volume XIII of the Journal of the Cincinnati Society of Natural History ( ), much new material has been collected and picked over, in part or wholly. The earlier washings, of which samples merely had been searched in 1890, have now been almost entirely worked out. The result is an astounding number of new species, the number of the undescribed forms falling little short of two hundred! Perhaps the most interesting of all the localities furnishing ostracoda is the Bryozoa bed, at the Falls of the Ohio, opposite the city of L,ouisville, Ky. In 1890, when my former paper describing species from this locality was written, the pickings from the small sample of washings then examined was believed to give a fair, if not a full, idea of the species occurring there. How far from the truth this conception was, and how other localities when carefully investigated may be expected to add, more or less largely, to the number of known species, is shown by the fact that, when the last of the washings from the Falls in my possession had been searched the number of species known from that locality was nearly doubled. This continual accession to the number of known forms proves that we have not yet reached that point where an approximately stable classification of the paleozoic representatives of the class is possible. My aim, therefore, in this and succeeding papers, in which I hope to publish illustrations and brief descriptions of the new species and varieties, is principally to add to the facts and data pertaining to specific variation, and to leave the restriction and characterization of the genera and families to such a future time when the discovery of more or less disturbing new forms will have become comparatively rare. JOUR. CIN. SOC. NAT. HIST., VOL. XIX, No. 6.) 1 PRINTED JUNE 26, 1900.

180 Cincinnati Society of Natural History. CTKNOBOLBINA SUBCRASSA, n. sp. Plate VIII, Figs. 1-3. Size: L,ength, 1.15 mm.; hight, 0.7 mm.; thickness, 0.6 mm.

2 180 Cincinnati Society of Natural History. CTKNOBOLBINA SUBCRASSA, n. sp. Plate VIII, Figs Size: L,ength, 1.15 mm.; hight, 0.7 mm.; thickness, 0.6 mm. Carapace widest in the posterior half, obliquely subovate, the hinge line long and straight. Flange thick and well developed along the posterior and ventral sides, weak or quite obsolete in front, partly overhanging the ventral contact edge of the valve and hiding a number of rather faintly marked transverse depressions between them. Anterior sulcus obsolete or distinguishable only in the dorsal region, the posterior one strongly impressed, especially upon the posterior side, extending obliquely backward and downward more than twothirds across the valve. A small tubercle occurs in the antero-dorsal corner of the posterior lobe, while a thin and prominent ridge runs along the lower side of the combined median and anterior lobes. Between this ridge and the flange the surface is sharply excavated. Surface without ornament. This species finds its nearest relations in C. crassa and C. fulcrata, occurring in the shales of the Black River group in Minnesota. A comparison with the published figures of these species will not only show this relationship, but at the same time reveal several obvious differences by which the species may be recognized. Formation and Locality. In a thin band of shale belonging to the Ridley limestone division of the Stones River group, near the bottom of the Kentucky gorge, at High Bridge, Ky. CTENOBOLBINA OBLIQUA, n. sp. Plate VIII, Fig. 4. Size: Length, 1.1 mm.; hight, 0.7 mm. without flange, 0.75 mm. with flange. This is a moderately convex and very simple species of the genus, there being a single sulcus, curved, but on the whole nearly vertical, and sharply defined on the posterior side only. The valves are shorter and more oblique than usual, and the flange a delicate projecting plate or fill; the surface is minutely reticulate or punctate. A small tubercle is situated near the middle of the autero-ventral fourth.

New American Paleozoic Ostracoda. 181 Only one other species of Ctenobolbina is known having a punctate surface; this is a Niagara species to which I gave the name C. punctata.

3 New American Paleozoic Ostracoda. 181 Only one other species of Ctenobolbina is known having a punctate surface; this is a Niagara species to which I gave the name C. punctata. The present form is relatively shorter, less convex, and strikingly different in the outline of the anterior half. The sulcus also is much less developed. Formation and Locality. Rare on thin slabs of limestone, from the lower portion of the Clitambonites bed of the Trenton group at Kenyon, Minn. CTKNOBOI/BINA SPICULOSA, n. Plate VIII, Fig. 5. Size : L,ength, 1.65 mm.; hight, with flange, 1.0 mm., without flange, 0.8 mm. This fine species, although given a very different expression by its spinous surface, is nevertheless a close ally of C. antespinosa, Ulr., with which it is also associated at the Falls of the Ohio. Comparing the two species, we find that the central tubercles and ridges of C. antespinosa are all reproduced in C. spiculosa, but in a more subdued form. The vertical anterior ridge is represented by a couple of spines merely. The posterior lobe, on the other hand, is more prominent and drawn out above into a strong spine. All the surface elevations are granulose in C. spiculosa, and, excepting one, spiniferous as well. Two bunches of spines occur also near the post-ventral margin. The flange is wider in C. spiculosa and merely convex instead of bent angularly, and the valve, excluding the flange, more nearly equal-ended. Formation and Locality. From the Devonian (Hamilton group) bryozoa bed at the Falls of the Ohio. CTENOBOLBINA ARMATA, n. sp. Plate VIII, Fig. 6. sp. Size: Length, 1.38 mm.; hight, 0.78 mm. This also is related to C. antespinosa, but is readily distinguished. The posterior sulcus passes completely through to the flange, which, on the contrary, is a comparatively insignificant feature. The lower portion of the posterior lobe is raised into a compressed spine, projecting outward and downward to the ventral margin. A similar but more prominent

4 182 Cincinnati Society of Natural History. and more curved spine is formed by the posterior extremity of the anterior lobe, which in this and other species of this section of the genus is longitudinal rather than vertical. Excepting the two ventral spines, the elevated portions of the surface are coarsely granulose. The middle lobe is rounded, situated about in the middle of the dorsal slope, and larger than the rounded upper portion of the posterior lobe. The large, compressed spines, arising in the post-ventral fourth of the valves, will distinguish this species from any other previously described. Formation and Locality. Same as the preceding. CTENOBOIVBINA CAVIMARGINATA, n. sp. Plate VIII, Figs Size: Length, 1.35 mm.; hight, without flange, 0.72 mm., with flange, 0.85 mm.; greatest thickness (from tip to tip of ventral spines), about 1.2 mm. In a side view the valves of this species are so much like C. armata that the two forms were at first confused. Interior and ventral views, however, are so strikingly different that the separation of the specimens proved unusually easy. Even on the outside the two forms present some differences. Thus, the flange is thicker and more extensive, the middle lobe relatively smaller, and none of the surface granulose. The main distinction, however, lies in the flange. In C. armata this is a simple plate, and so little developed that it scarcely hides the contact edges. In C. cavimarginata, however, it extends considerably beyond the edge and is supported at regular intervals by cross-walls, so as to form from ten to twelve deep rounded cavities. The end view is triangular in both, but in C. cavimarginata the lower part of the profile is much thicker than it is in C. armata. Formation and Locality. Same as the preceding. CTENOBOIvBINA INSOLENS, n. Sp. Plate VIII, Figs. 10 and IT. Size: Length, with flange, 1.88 mm.; without flange, 1.70 mm.; hight, without flange, 0.94 mm., with flange, 1.20 mm.

New American Paleozoic Ostracoda. 183 This also belongs to the C. antespinosa section of the genus, and stands in some respects intermediate between that species and C. cavimarginata.

5 New American Paleozoic Ostracoda. 183 This also belongs to the C. antespinosa section of the genus, and stands in some respects intermediate between that species and C. cavimarginata. However, in views of the interior, the broad concave flange reminds even more strongly of C. spiculosa. The anterior ridge or tubercle of C. antespinosa is present; also a rounded knob in the post-cardinal angle, whose representative is more obscurely indicated in C. cavimarginata. The lobatiou of the central and posterior portions of the valves agrees better with the conditions prevailing in C. cavimarginata and C. armata than those marking C. antespinosa, but, instead of rising into curved spines, the lower portions of the posterior and anterior lobes are lost in the convex flange. The latter is peculiar in two respects, first, in the fact that its junction with the body of the valve is not distinguishable externally, and, second, in its limited extent and abrupt termination just in front of the middle of the vertical edge. The contact edges around the ventral half are finely toothed, a feature generally present in the typical section of the genus, but otherwise unknown in this section. The raised portions of the surface are more or less distinctly granulose. Formation and Locality. Same as the preceding. CTKNOBOIVBINA GRANOSA, n. sp. Plate VIII, Fig. 12. Size: length, without flange, 1.0 mm.; hight, with flange, 0.68 mm., without flange, 0.58 mm. A rather small, convex and granulose species, with a subcentral sulcus extending only about half across the valves, a small longitudinal prominence just beneath it and a broadly scalloped, delicate frill overhanging the post-ventral edge. The latter is generally broken. C. bispinosa, from the Utica group at Cincinnati, and C. punctata, from the Niagara group, at Iyockport, N. Y., are probably its nearest allies. Formation and Locality. Etched from limestone slabs containing an abundance of br} ozoa received from Mr. Charles Schuchert, who collected them from the lower Helderberg formation, in Albany County, N. Y.

184 Cincinnati Society of Natural History. CTENOBOLBINA LOCULATA,n.sp. Plate VIII, Figs. 13 and 14. Size: length, 1.00 mm; hight, without flange, 0.54 mm., with flange, 0.60 mm.

6 184 Cincinnati Society of Natural History. CTENOBOLBINA LOCULATA,n.sp. Plate VIII, Figs. 13 and 14. Size: length, 1.00 mm; hight, without flange, 0.54 mm., with flange, 0.60 mm. The lobation in this small species is singularly like that of the Ordovician C. crassa and C. stibcrassa, and the latter is simulated even to the possession of a small node in the upper and inner corner of the posterior lobe. The valves in C. loculata, however, are relatively longer and more equal-ended, while the construction of the flange is quite different. Instead of the thick, yet simple type of flange, pertaining to those species, we have here a strongly undulated plate supported by walls or pillars which divide the space intervening between the flange and the ventral edge into four subequal cavities. The undulations and extent of the flange remind of the preceding species, C. granosa, but in that form there are no cavities beneath, while the lobes are appreciably different, and the surface granulose instead of smooth. Formation and Locality. Rather rare in Safford's Maury shales of the L,ower Carboniferous system, at Mt. Pleasant, Tennessee. KlRKBYA CYMBULA, n. Sp. Plate VIII, Figs Size: L,eft valve: length, 0.97 mm.; hight, 0.50 mm.; thickness, 0.20 mm. Right valve: length, 1.10 mm.; hight, 0.54 mm. Carapace oblong subquadrate, the hinge line long, straight or slightly convex, the ventral edge straight or slightly sinuate in its central portion, the anterior margin obliquely truncate and most prominent at the antero-cardinal angle; the posterior margin more rounded, though forming an angle where it joins the hinge line. Sides of valves enclosed by a thin raised rim, within which the surface is almost flat and traversed by more or less irregular longitudinal ribs, ten or eleven in number, separated by narrow furrows, of which each contains a row of small punctse. Situated a little behind and more above the middle of the valve is a well-defined oval pit. 6

New American Paleozoic Ostracoda. 185 Though falling readily enough within the limits of the genus Kirkbya, as now understood, none of the species heretofore described seem to be enough like K.

7 New American Paleozoic Ostracoda. 185 Though falling readily enough within the limits of the genus Kirkbya, as now understood, none of the species heretofore described seem to be enough like K. cymbula to require comparisons. The next described species, K. germana, is nearer than any other known to me. Formation and Locality. From the Devonian bryozoa bed, Falls of the Ohio. KlRKBYA GERMANA, 11. Sp. Plate VIII, Figs Size: Right valve: length, 1.10 mm.; hight, 0.60 mm.; thickness, 0.23 mm. L,eft valve: length, 1.20 mm.; hight, 0.60 mm.; thickness, 0.25 mm. This species, evidently, is closely related to K. cymbula, with which it is also associated. On close comparison we find that the outline is not exactly the same, the anterior extremity of the hinge line being less prominent and angular. The marginal rim is set a little further from the edge, and in the anterior part does not follow the outline of the valve, but bends downward from above, the junction with the lower portion forming an obtuse angle a little above the midnight. The space included within the marginal rim also is convex, instead of flat, while the longitudinally arranged ribs and pits are much larger, and, therefore, fewer, there being but six where K. cymbula has ten or eleven. Formation and Locality. Same as the preceding.

186 Cincinnati Society of Natural History. EXPLANATION OF PLATE VIII. K1X, THE FIGURES ARE MAGNIFIED TWENTY DIAMETERS. Figs, i to 3. Ctenobolbina subcrassa, n. sp., p. 180 1. A right valve. 2 and 3.

8 186 Cincinnati Society of Natural History. EXPLANATION OF PLATE VIII. K1X, THE FIGURES ARE MAGNIFIED TWENTY DIAMETERS. Figs, i to 3. Ctenobolbina subcrassa, n. sp., p A right valve. 2 and 3. Lateral and ventral views of a left valve. Stones River group, High Bridge, Ky. Fig. 4. Ctenobolbina obliqua, n. sp., p. 180 A right valve retaining some of the flange. Trenton group, Kenyon, Minn. Fig. 5. Ctenobolbina spiculosa, n. sp., p. 181 Nearly perfect right valve. Fig. 6. Ctenobolbina armata, n. sp.,. p. 181 A right valve showing the usual characters of the species. Figs. 7 to 9. Ctenobolbina cavimarginata, n. sp., p and 8. Lateral and posterior views of a left valve. 9. View of interior of another left valve. Figs. 10 and II. Ctenobolbina insolens, n. sp., p Exterior of a left valve. 11. Interior of another left valve. Fig. 12. Ctenobolbina granosa, n. sp.,. - p. 1S3 A perfect left valve. Lower Helderberg group, Albany County, N. Y. Figs. 13 and 14. Ctenobolbina loculata, n. sp., p Exterior of a right valve, apparently perfect. 14. Interior of a left valve. Kinderhook group, Mt. Pleasant, Tenn. Figs. 15 to 18. Kirkbya cymbula, n. sp., p. 184 '15. A right valve. 16, A left valve, relatively shorter. 17 and 18. End and ventral views of same. Figs. 19 to 22. Kirkbya germana, n. sp., p A right valve. 20. End view of same. 2i. A left valve, relatively longer. 22. Vertical edge of same.

9 VOL. XIX. No. VI. PLATE VIII.

STRUCTURAL FEATURES OF COCKROACH EGG CAPSULES. II. THE OOTHECA OF CARIBLATTA LUTEA LUTEA (ORTHOPTERA: BLATTIDAE) 1

STRUCTURAL FEATURES OF COCKROACH EGG CAPSULES. II. THE OOTHECA OF CARIBLATTA LUTEA LUTEA (ORTHOPTERA: BLATTIDAE) 1 FRED A. LAWSON Department of Zoology and Entomology, The University of Tennessee, Knoxville