lO NEW YORK STATE MUSEUM 



Plates of Aspidicthys and Dinichthys halmodeus (Clarke) 



Orthoceras nuntium Hall 



O. subulatum Hall 



Tornoceras uniangulare (Conrad) 



Cyrtoceras citum Hall 



Pleurotomaria rugulata Hall 



Styliolina fissurella Hall 



Panenka lincklaeni Hall 



P. equilatera Hall 



Nuculites nyssa Hall 



Pterochaenia fragilis (Hall) 



Liopteria laevis Hall 



Pterinopecten dignatus Hall 



Actinopteria muricata Hall 



Orbiculoidea minuta Hall 



Liorhynchus limitare (Vanuxem) 



Chonetes mucronatus Hall 



The following additional species occur in the more calcareous 

 beds near the base of the formation : 



Phacops rana Green 

 Orthoceras incarceratum Clarke 

 O. lima Hall 



Tentaculites gracilistriatus Hall 

 Pleurotomaria lucina Hall 

 Aviculopecten cf. fasciculatus Hall 

 Modiomorpha subalata (Conrad) 

 M. concentrica Hall 

 Cypricardinia indenta (Conrad) 

 Microdon bellistriatus (Conrad) 

 Nuculites oblongatus Conrad 

 Palaeoneilo plana (Conrad) 

 Tropidoleptus carinatus (Conrad) 

 Spirifer audaculus Conrad 

 Ambocoelia umbonata (Conrad) 

 A. praeumbona Hall 

 Athyris spiriferoides (Eaton) 

 Coelospira Camilla Hall 

 Terebratula sp. 



Stropheodonta inequistriata (Conrad) 

 Leptostrophia perplana (Conrad) 



