544 Contributions to Invertebrate Palaeontology. 



CEPHALOPODA. 



Orthoceras Breynius. 



0. nuntium Hall. 



0. Ohioense Hall. 



0. profundinn Hall. 

 Trematoceras Whitf. 



T. Ohioense Whitf. 

 GoMPHOCERAs Sowerbv. 



G. amphora Whitf. 



G. eximiuni Hall. 



G. Hyalti Whitf. 



G. sciofense Whitf. 

 Cyrtoceras Goldfuss. 



C. cretaceiim Whitf. 



C. Ohioense Meek. 



C. iindulatum Vanuxem ? 

 Gyroceras Meyer. 



G. Columbiense Whitf. 

 G. Cyclox)s Hall. 

 G. inelegans Meek. 

 G. Ohioense Meek. 

 G. seniinodosum Whitf. 

 CRUSTACEA. 



Dalmania Emmerich. 



D. Calypso Hall. 



D. Helena Hall. = D. Ohioense Meek. 

 D. selenurus Green. 

 PiiACOPS Emmerich. 



F. 7'ana Green. 

 Proetus Steininger. 



P. crassimarginatus Hall. 



Species from above the Bone-Bed. 

 CBINOIDEA. 



GONIASTEROIDOCRINUS Lvon. 



G. spinigerus Hall. 

 BRAGHIOPODA. 



LiNGULA Brugiere. 



L. Manni Hall. 

 L. ligea Hall. 



