Cent. 



122 



the times jast preceding the appearance of man, or perhaps 

 in the early stages of the present human era. But no relics of 

 man have been found in the two or three caves in Pennsylvania 

 thus far explored. They were certainly not caves of habita- 

 tion ; but rather of the nature of sink holes. 



Oentemodon sulcatus See Clepsisaurus]pennsylvanicus. 

 Trias, 

 Centronella crassicardinalis. (Whitfield. Bulletin Am. 



^t'-Mus. Nat. Hist. No. 3, Warsaw L.) 

 Collett's Indiana Rt. of 1882, plate 29, 

 figs. 50, 51, 52. Outside, inside and 

 profile of one valve. SubcarhonifeT- 

 ous ( Warsaw limestone) formation, at 



Spergen hill, Alton, &c. This may be the centronella found 



by I. C. White in the middle layers of the Trough creek lime- 

 stone, Huntingdon Co., Pa., at the bottom of the Mauch Chunk 

 red shale formation, T3, p. 77. — XL 



Ceramopora ? 00, p. 231, Spec. 203-12, from Belle- 



fonte, in Trenton limestone^ lie. 



Ceratiocaridse. See Beecher's new species from the Che- 

 mung-Catskill beds at Warren, Pa. — Echinocaris socialis ; 

 Elymocaris siliqua ; Tropidocaris alternata, bicarinata, 

 and interrupta. — VIII-IX, 



Ceratiocaris beecheri. Clarke, Bull. 16, U. S. G. S. 1885, 



page 44, pi. 2, fig. 1, tail and 

 spines, natural size, of a 

 crustacean of the Naples 

 ( Upper Genesee) hlack 

 shales of Cashaqua creek, 

 Livingston Co., N. Y. 

 Unique specimen. — VIII 



Clk. B.I6. 



Ceratiocaris simplex. Clarke, Bull. 16, U. S. G. S. 1885, 



vute'. 2 page 43, 44, pi. 2, fig. 2, shield (carapace) 



natural size^ of a crustacean of the Naples 

 ( Upper Genesee) hlacJc shale^ immedi- 

 dk. B.is.^" — ' '' ™™ " "'^ 2.| ately under the concretionary limestone 

 of Parrish gully, Ontario Co., N. Y. VIII e'. 



