304 ('. SCHUCHERT — LOWEK HELDERBERG-ORISKANY FORMATIONS 



Camarotcechia pleioplewra Hall. 16080, 28095. 



Syn. Rhynchonella multtitriata and R. oblaia Hall. 

 Camarotcechia pleiopleura filchiana ( Hall). 

 Camarotoechia principalis Hall (= C. speciosa Ball). 

 Camarotcechia septala Hall. Species of no value. 

 Eatonia peculiaris (Conrad). 1.0651, 26057. 

 Eatonia pumila Hall (= E. whitjveldfi. 

 Eatonia whitfieldi Hall. 20058, 28080, 28090. 



Spirifer arenosus (Conrad). 4121,4214,8412, 10645, 14515, 166806, 26048, 28102. 

 Spirifer murchisoni Castelnau (=#. arrectus Hall). 8413, 10046, 16669, 20051, 



28098. 

 Spirifer tributia Hall. 10047. 



Reticularia fimbriata (Conrad). Hall collection, Albany. 

 Metaplasia pyxidata Hall. 4215, 1004S. 

 Oyrtina rostrata Hall. 

 Atrypa reticularis Linne. 28001. 



Anoplotheca dichotoma (Hall). Hall collection, Albany. 

 Anoplotheca Jhibellites 1 (Conrad). 10050. 

 Meristella lata Hall. 16080, 20053, 28113. 

 Meristella walcotti Hall and Clarke?. 10072. 

 Pmtagonia unisulcata (Conrad). Hall collection, Albany. 

 Megalanteris oralis Hall. 20050. 



Rensselseria ovoides (Eaton). 4118, 4216, 8428, 8430, 10652, 16671, 28087, 26049. 

 Beechia suessana Hall. 16680. 

 Tentaculites arenosus Hall. 

 Conularia lata Hall. 



Belleroplum curvilineatus Conrad (also in Schoharie grit). 

 Platyceras nodosns Hall. 



Platyceras (Orthonychia) tortuosus (Hall). 10655. 

 Platyceras n. sp. 28083. 



Diaphorostowa ventricosa (Conrad). 4802, 26050, 28080, 28082. 

 Strophostylus expansus Hall. 

 Cyrtolites (?) expansus Hall. 10659. 

 Orthoceras arenosum Hall. 

 Aviculopecten gebhardi (Conrad). 10654. 

 Aviculopecten recticosta (Hall). 

 Actinopteria textilis armaria (Hall). 

 Megambonia bellistriala Hall. 

 Megambonia lamellosa Hall. 26055. 

 Palseop i n na fiabell um Hal 1 . 

 Homalonotus major Whitfield 

 Phacops cristata Hall. 28079. 



LOWER OMSK ANY OF NEW YORK 



Previous to the year 1892, the known Oriskany formation in the state 

 of New York consisted of but a thin sandstone horizon, nowhere known 

 to exceed 30 feet in thickness. The specific faunal gap between it and 

 the Helderbergian below was considerable; but in that year Doctor 



