MARCEELUS LIMESTONES AND THEIR FAUNAS 1.25 



G. oviforme Hall (Schoharie, Manlius) 



G-. solidum Hall (Manlius) 



Gr. trans versum Hall 



Nephriticeras bucinurn Hall (Manlius) 



Nautilus liratus Hall (Manlius) 



Discites marcelleiisis Yanuxem (Manlius) 



Parodiceras discoideum Conrad (Manlius, Schoharie) 



Agoniatites expansus Yanuxem (Schoharie, Cherry Valley, 

 Manlius, Union Springs, Flint creek, Stony Point, Lime Kock (in 

 Onondaga limestone) ) 



Thoracoceras wilsoni sp. nov. (Manlius) 



Orthoceras aptum Hall (Manlius) 



O. fustis Hall (Manlius) 



O. marcellense Yanuxem (Manlius:) 



O. constrictum Conrad (Manlius) 



Bactrites sp.? 



Pleurotomaria rugulata Hall 



Eiuomphalus planodiscus Hall (Manlius) 



Loxonema delphicola Hall (Manlius) 



Macrochilina onondagaensis sp. nov. (Manlius) 



Chaenocardiola curta Hall (Manlius) 



Panenka ventricoea Hall (Manlius) 



Liorhynchus limitare Hall (Manlius) 



Ambocoelia cf. nana Craoau (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 Marcellus 

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

 daga limestone in the neighborhood of Leroy we have a specimen, 

 incomplete but doubtless representing a large individual of this 

 species. 



