20 CATALOGUE OF THE 



Pleurotomaria ambigua, Hall. 



Pleurotomaria calphurnia (?) Billings. 



Pleurotomaria carinata, James. 



Pleurotomaria dryope, Billings. 



Pleurotomaria halli, S. A. Miller. 



Pleurotomaria lenticularis, Sowerby. 

 t__*Pleurotomaria ohioensis, James. 

 ^JtPleurotomaria subconica, Hall. 



Pleurotomaria subtilstriata, Hall. 



Pleurotomaria tropidophora, Meek. 



Pleurotomaria umbilicata, Hall. 

 L^Raphistoma lenticulare, Conrad. 



Raphistoma planispira, Hall. 



Raphistoma planistria. Hall. 



Raphistoma staminium, Dennis. 



Subulites acceptus, Ulrich. 

 *Trochonema umbilicatum, Hall. 



Class PTEROPODA. 



Conularia formosa, Miller & Dyer. 

 Conularia quadrata, Walcott. 

 Conularia trentonensis, Hall. 

 Hyolithes amerieanus, Billings. 



Class CEPHALOPODA. 



Cyrtoceras amoenum, S. A. Miller. 



Cyrtoceras conoidale, Wetherby. 



Cyrtoceras irresjulare, Wetherby. 



Cyrtoceras magister, S. A. Miller. 



Cyrtoceras ventricosum, S. A. Miller. 



Cyrtoceras vallandighami, S. A. Miller. 



Endoceras annulatum, Hall. 



Endoceras approximatum, Hall. 

 *Endoceras magniventrum, Hall. 

 ^Endoceras proteiforme, Hall. 



Endoceras proteiforme, var. strangulatum, Hall. 



