542 Contributions to Invertebrate Palseontology. 



Pterinea Goldf. 



P. Jiabella Conrad ? The specimens referred to this 

 species are very doubtfully identified. They are 

 large coarse forms, very unlike any of those in the 

 higher beds. 

 Mytilarca H. and W. 



M. ponderosa H. and W. 



M. percarinata Whitf. 

 CoNOCARDiuM Brown. 



C. trigonale Hall. C. Ohioense Meek, is the young 

 of the above. 

 GoNioPHORA Phillips. 



G. perangulata H. and W. 

 Paracyclas Hall, 



P. lirata Conrad. 



P. Ohioensis Meek = P. lirata Conrad. P. occiden- 

 talis H. and W. 

 Modiomorpha H. and W. 



M. elliptica? 



31. perovata Meek. 

 Sanguinolites McCoy. 



*S*. Sanduskyensis Meek. 

 GASTEROPODA. 



Platyceras Conrad. 



P. attenuatum Meek. 



P. bucculentum Hall. 



P. carinatum Hall. 



P. conicum Hall. 



P. dumosum Conrad. 



P. viultispinosum Meek. 



P. squalodens Whitf. 

 Platyostoma Conrad. 



P. lichas Hall. 

 EuoMPHALUs Sowerby. 



PJ. Decewi Billings=/*Zei(rono/ws Decewi Hall. 

 Turbo Klein ? 



T. Kearneyi !!&]]= Palieotrochus Kearneyi. 



T. Shiimardi D'Vern. 



