MARCELLLtS LIMESTONES AND THEIR FAUNAS 125 



G. oviforme Hall (Schoharie, Manlius) 



G. solidum Hall (Maolius) 



G. transversum Hall 



Nephriticeras bucinum Hall (Manlius) 



Nautilus liratus Hall (Manlius) 



Discites marcellensis Tamixem (Manlius) 



Parodiceras discoideum Conrad (Manlius, Sclioharie) 



Agoniatites expansus Vanuxem (Schoharie, Cherry Valley, 

 Manlius, Union Springs, Flint creek. Stony Point, Lime Rock (in 

 Onondaga limestone) ) 



Thoracoceras wilsoni sp. nov. (Manlius) 



Orthoceras aptum Hall (Manlius) 



O. fustis Hall (Manlius) 



O. marcellense Tanuxem (Manlius) 



O. constrictum Conrad (Manlius) 



Bactrites sp.? 



Pleurotomaria rugulata Hall 



Euomphalus planodlscus Hall (Manlius) 



Loxonema delphicola Hall (Manlius) 



Macrochilina onondagaensis sp. nov. (Manlius) 



Ghaenocardiola curta Hall (Manlius) 



Panenka ventricoea Hall (Manlius) 



Liorhynchus limitare Hall (Manlius) 



Ambocoelia cf. nana Orahau (Cherry Valley) 



Agoniatites expansus. This species, the diagnostic form of this 

 horizon, is more generally diffused geographically than any of the 

 others. At the west it occurs freely at Wood's quarry south of 

 Union Springs, where the horizon lies close upon the Onondaga 

 limestone. Still farther west, as this horizon approaches more 

 and more nearly the Onondaga limestone, traces of it are less 

 often seen, and west of the Flint creek section, Ontario county, 

 the shell has been observed only at the base of the Marcel 1 us 

 section at Stony Point, Lake Erie. From outcrops of the Onon- 

 daga limestone in the neighborhood- of Leroy we have a specinn n, 

 incomplete but doubtless representing a large individual of this 

 species. 



