96 NEW YORK STATE MUSEUM 



to the Hudson river. These were, however, in every case insignifi- 

 cant in thickness and less characteristic in development than those 

 of the Normanskill formation, the thickest sandstone bed measur- 

 ing but 3 feet. 



The Snake hill locality has furnished the following fauna: 



Graptolites 



Dicranograptus nicholsoni Hopkinson 



Diplograptus (Mesogr.) putillus Hall 



Corynoides sp. 

 Crinoidea 



Glyptocrinus sp. 



Heterocrinus ? gracilis Hall 



Cremacrinus sp. 



Carabocrinus cf. radiatus Billings 

 Cystoidea 



Edrioaster saratogensis Rued. 

 Bryozoa 



Paleschara ulrichi Rued. 

 Brachiopoda 



Schizocrania filosa (Hall) 



Plectambonites sericeus typus (Sowerby) 



Plectorthis cf. whitfieldi (Winchell) 



Dalmanella testudinaria (Dalman) 



Plaesiomys retrorsa auct. 



Rafinesquina alternata (Emmons) 



Clitambonites americanus (Whit-field) 



Parastrophia hemiplicata Hall 



Zygospira recurvirostris (Hall) 

 Pelecypoda 



Whiteavesia cincta Rued. 



W. cumingsi Rued. 



Orthodesma? subcarinatum Rued. 



Whitella elongata Rued. 



Clidophorus ventricosus Rued. 



C. foerstei Rued. 



Ctenodonta levata (Hall) 



C. declivis Rued. ] 



C. prosseri Rued. 1 



C. radiata Rued. I 



C. recta Rued. \ 



C. subcuneata Rued. i 





