17:3 NEW YORK STATE MUSEUM 



The surface of this Orthoceras is covered with Bryozoa, Crania. 



and Spirorbis. 



Orthoceras aegea Hall 



l»al. X. Y. vol. o, pt 2, p. 2Do, pi. 82 



The i-epresentatives of this species in the limestone are small, 

 the most perfect specimen being only 14.5 mm long, and having 

 a greatest diameter of G mm, but fragments of a larger specimen 

 were found. In bed F of the upper shales large specimens were 

 found and fragments of the shell retain all the characteristic 

 features of the surface. 



Orthoceras fenestrulatum Clarke 



X. Y. state geol. 13th an. rep't. 1804. 1 :108, pi. 2 

 In bed VIII a large internal mold was found to which bits of 

 the shell still adhere. It is 53 mm long, and has a greatest 

 diameter of 29 mm. The surface ornamentation has been suffi- 

 ciently impressed on the mold to show its character distinctly. 

 Other specimens are portions of the thin shell, showing the inner 

 surface and the external ornamentation reversed. 



NEPHRITICERAS Hvatt 



Nephriticeras bucinum (Hall) 



Pal. X. Y. vol. 5, pt 2, p. 412, pi. 106, 107, 109 



A large cast showing distinctly the finer surface ornamenta- 

 tioi\ and the position of the septa was found in bed VII. Its 

 length is 70 mm and greatest diameter 44 mm. Portions of the 

 surface are overgrown with Bryozoa. 



CRUSTACEA 



TKILOBITA 



pHAcops Emmrich 



Phacops rana (Green) 



Pal. N. Y. vol. 7, p. 19, pi. 7, 8, 8a 



This species is common in the lower limestone beds and 

 sparingly represented in the upper. Portions of the cephalon 

 and pygidium were found. Some of the specimens referred to 



