90 



PALEONTOLOGY OF NEW YORK. 



Externally the shell is characterized by its posterior apices, fine concentric 

 striae, and general similarity to " Discina." The shell-substance is tenuous and 

 appears to be wholly corneous. 



Genus DISCI NOLEPIS, Waagen. 1885. 



18S5. JUiiimilejiii, WAA(iEN. Mem. Geol. Survey of India, Palieontolog'ia Indica: Ser. xiii, Salt-Range 



Fossils, I. Productus-limestone Fossils, iv (fas. 5), Brachiiipoda, p. 749. 



Diagnosis. " The shell is of very small size with two unequal valves, which 

 are very flat, leaving scarcely any room for the animal between them. 



" The lower ventral valve is hardly at all 

 vaulted in any direction, and appears flatly 

 spread out like a small flsh-scale, only the 

 apex is a little elevated. It is removed from 

 the margin towards the median part of the 

 valve. The margin of the valve nearest the 

 apex is broadly cut out by a deep incision no. 45. i-caicie-vaive. fig. le. Brachial vaivc. 

 reaching to the top of the apex. 



" The upper or dorsal valve is in shape similar to the other one, with a 

 slightly elevated eccentric apex, but without an incision. 



"The surface in both valves is either smooth or covered with a fine gran- 

 ulation." (Waagen, loc. cit.) 



Type, Discinolepis granulata, Waagen. PI. l.xx.xvi, figs. 5-7. " Obolus Beds," 

 Salt Range = Primordial. 



Genus K U T R G I N A , Billings. 1861. 



'^■v-./ 



^^^ 



Uisriilultpia (frilh nuiu! . 



Aller Waaoe.s. 



PLATE IV, FIGS. 10-20. 



1861. Obolus, Billings. Geolog-y of Vermont, vol. ii, p. 946. 



1861. Kutiyrf/hia. Billings. Geolog-y of Vermont, Vil. ii, p. 948 (foot-note). 



1863. Obobis, OboleUa, Billings Geological Survey of Canada, pp. 248, 284. 



1S64. Obolella, Holl. Quarterly Journal Geological Society, vol. xxi, p. 101. 



ISe,"). Oboliuf, Obohlla {Kutor(/i7ia), Billings. Palseozoic Fossils, vol. i, pp. 6, S. 



1866. Obolella f, Davidson. British Silurian Bi-achiopoda, p. 62. 



1868. Kntorgina, Davidson. Geological Magazine, vol. v, p. 312. 



1871. Kutorg'uui, Davidson. British Silurian Bi-achiopoda, Appendix, p. 342. 



1873. Iphidea (??), Mbek. Sixth Ann. Rept. U. S. Geological Survey Terr., p. 479. 



1874. TrematisJ, White. Geogr. and Geol. Surv. West 100th Merid., Prelim. Rept., p. 6. 



187"). Treiaatixf, White. Geogr. and Geol. Surv. West 100th Merid., Final Rept., vol. iv, pt. i, p. 36. 



