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SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 57 



the Cambrian and Ordovician deposits within the block of sandstone 

 that I found. With this view in mind the Hoyt Hmestone species 

 are referred to the Upper Cambrian and the Aylmer sandstone 

 species to the Ordovician. 



STRATIGRAPHIC POSITION OF FAUNA. 



The Potsdam-Hoyt fauna as it occurs about the Adirondack Moun- 

 tains in New York State is found in the Potsdam sandstone and the 

 superjacent Hoyt Hmestone. We have represented in the collection 

 of the United States National Museum the following species : 



Protozoa . 



Cryptozoon proliferum Hall , 



Ajinelida. 



Climactichnites 



Scolithus linearis Haldeman ?. . . , 

 Planolites 



Brachiopoda. 



Lingulella prima (Conrad) 



Lingulella (Lingulepis) acuminata (Conrad) 



Gastropoda. 



Triblidium cornutaforme (Walcott) 



IMatherella saratogensis ( Walcott) 



Palaeacmjea typica Hall and Whitfield 



Eccyliopterus sp 



Ophileta ? sp 



Sinuopea ? sp 



Matthevia variabilis Walcott 



Pteropoda . 



Hyolithes gibbosus Hall and Whitfield 



Hyolithellus papillatus Walcott 



Pelagiella hoyti (Walcott) 



Pelagiella minutissima (Walcott) 



Trilobita. 



Ptychoparia minuta (Bradley) 



Ptychoparia matheri Walcott 



Conocephalina whitehallensis Walcott. 



Pagodia seelyi Walcott 



Agraulos saratogensis Walcott 



Lonchocephalus calciferus (Walcott). . 



Ptychaspis speciosus Walcott 



Dicellocephalus hartti (Walcott) 



Dicellocephalus tribulis Walcott 



Protichnites logananus Marsh 



Protichnites wilsoni Logan 



Upper Cambrian. 



Potsdam Hoyt 



sandstone, limestone. 



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