108 



NEW YORK STATE MUSEUM 



Of the 60 species listed by Hartnagel from the Cobleskill of 

 Schoharie county a comparatively limited number may be re- 

 garded as diagnostic of the formation. Among the corals and 

 hydrocorallines the genera Favosites and Stromatopora must be 

 regarded as of chief importance. The former is represented 

 by a species intermediate between F. ni a gar ens is and 

 F . helderbergiae, which was described by Schuchert as a 

 variety of the latter under the varietal name p recedens 

 [fig. 7]. Its chief distinction is in the smaller size of the heads. 



Among the brachiopods may be mentioned O r t h o t h e t e s 

 interstriatus [fig. 8], a small finely striated species; 

 Chonetes j e r seyensis [fig. !)] characterized by curved 

 s1 riae in the adult ; Spirifercorallinensis [fig. 10] and 

 S. eriensis [fig. 11]. both small species, the former with 

 obsolescent, the latter with few coarse rounded plications; 

 VV h i t f i e 1 de 1 1 a nucleolata [fig. 12], a small smooth 

 and nearly circular species ; C a m a r o i o e c 1> i a ? 1 a m e 1 1 a t a 

 [fig. 13], a broad species with deep sinus and lamellose striae; 

 and C a m a r o t oe chia 1 i t c h f iel de n s i s . [fig. 14], a 

 more robust form, with fewer and coarser plications. 



Among tin 1 pelecypods, Pterinea securif ormis and 

 T e 1 1 i n o ni y a e qui] a t e r ;i [ tig. 15] are most abundant. 

 The former is a large smooth aviculoid, the other a nearly sym- 



