90 



PALEONTOLOGY OF NEW YORK. 



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

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

 appears to be wholly corneous. 



Genus D 1 S C I N L E P I S , Waagen. 1885. 



1885. DincinalfpU, Waagen. Mem. Geol. Survey of Inili;i, Pjilxoiitoloffia Indica: Ser. xiii, Salt-Rang-e 



Fossils, I. I'l-odiictus-linifistoiie Fos.sils, iv (fas. S), Brachiopoda, p. 749. 



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

 are very llat, 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 fish-scale, only the 

 apex is a little elevated. It is removed from 

 the margin towards the median part of the 

 valve. The mar"in of the valve nearest the JM^rh,ohpisffra,miata. 



•^ Alter Waagen. 



apex is broadly cut out by a deep incision riG.45. PcUcie-vaivu. fig. w. Brachial vaive. 

 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 Ijotli valves is eitlier smooth or covered with a fine gran- 

 ulation." (Wa.\gen, loc. cit.) 



Type, Disc.inolepis granulala, Waagen. Pi. Ixx.xvi, figs. 5-7. " Obolus Beds," 

 Salt Kan<re = Primordial. 



% ./-. 



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



plate IV, FIG.S. 10-20. 



I8C1. ObolttS, ISiLLiNa.s. Geology of Verinoid, vol. ii, p. 946. 



1861. Kutmr/hia, Bili.tnos. Geology of Vermont, Vi-1. ii, p. 948 (foot-note). 



1863. Obolns, Obolella, Bilt.inus Geological Survey of Canada, pp. 248, 284. 



1864. OholeUa, Holl. Quai'ferly Journal Geological Society, vol. xxi, p. 101. 

 186,5. Obolus, Obolella {Kutorc/lna), Bii,i,[N(i.s. P.ala^ozoic Fo.ssils, vol. i, pj). 6, S. 

 1866. Obolella'^, Davidson. British .Silurian Brachiopoda, p. f!'2. 



1865. Kutorgina, Davidson. Geological M.agazine, vol. v, p 312. 



1871. Kutorgina, Davidson. British Silurian Brachiopoda, Appendix, p. 342. 



1873. Iphidea (??), Mkkk. Sixth Ann. Rept. U.S. Geological Survey Ten-., p. 479. 



1874. T'-ematU', White. Geogr. and G(!ol. Surv. West 100th Meriil., Prelim. Kept., p. G. 



1875. Treiimtinf. Wuitk. Geogr. and (Jeol. Surv. West lOOlh Mei-id., Final Rept., vol. iv, pt. i, p. 36. 



