PALEONTOLOGY. 



Macrocheieus Phillips. 



M. prisons Whitf. 

 Peeurotomaria DeFrance. 



P. adjutor Hall. 



P Doris Hall—Cyclonema Doris Hall. 



P. Hebe Hall. 



P Lucina Hall. 

 Murchisonia De Verneuil. 



M. desiderata Hall. 



M. Maia Hall. 



M. obsoleta Meek. 

 Dentalium L,kraseus. 



D. Martini Whitf. 

 Beeeerophon Montfort. 



B. Newberryi Meek. 



B. PelopsUall 



B. propinquus Meek. 

 PTEROPODA. 



Contjearia Miller. 



C. elegantula Meek. 

 Tentaculites Schloth. 



T. scalariformis Hall. 

 CEPHALOPODA. 



Orthoceras Breynius. 



O. nuntium Hall. 



O. Ohioense Hall. 



O. profundum Hall. 

 ' Trematoceras Whitf. 



T. Ohioense Whitf. 

 Gomphoceras Sowerby. 



G. amphora Whitf. 



G. eximium Hall. 



G. Hyatti Whitf. 



G. sciotense Whitf. 

 Cyrtoceras Goldfuss. 



C. cretaceum Whitf. 



C. Ohioense Meek. 



C. undulatum Vanuxem ? 

 Gyroceras Meyer. 



G. Columbiense Whitf. 



G. Cyclops Hall. 



G. inelegans Meek. 



G. Ohioense Meek. 



G. seminodosum Whitf. 



