Obthoc. 



550 



page 52, plate 2, fipjs. 12, 13, opposites sides ; 14, young individ- 

 ual; remarkable sculpturing of surface; very interesting as 

 the only American Devonian representative of the European 

 Orthoceras socium group, characteristic of Barrande's Etage E, 

 all of them thin shells, with wavy scale-like ring marks, 

 and no lines lengthways. Specimens from Parrish gully, 

 Naples; from Hatch hill; from Briggs gully, Honeoye lake, N. 

 Y, —-Upper Oenesee {Naples) shales. VIII e. 



Orthoceras foliatum, Hall. 



'V// h 



15th. Annual Eeport, 1862, 



page 74, plate 7, fig. 6, interior, showing lamellose extensions 

 into the surrounding stone ; 7, a cast (imprint) showing sinu- 

 osity of the plate-like projections on the front side, being gen- 

 erally curved downwards, on the back of the shell, and 

 abruptly bent on the dorsal line. A specimen, of which the 

 shell only is preserved in the stone, is more than 7^ in. long. 

 Fragments and impressions not uncommon in the Schoharie 

 grit ; but differ from those of Gyrtoceras eugenium^ in having 

 strong rings nearly up to the aperture, and being perfectly 

 straight (for at least 8 inches.) — Vllh, 



