624 GEOLOGY OF OHIO. 



Genus Poroellia. L^veill^. 

 Poreellia Sciota, Hall. 



GkntjS Nyassa. 

 Nyaasa arguta. 



Genus Geammysia. DeVerneuil. 



Grammysia secundo , Hall. 

 " Ksulcata. {?) 



GASTEROPODS. 



(Univalve Shells.) 



Genus Naticopsis. McCoy. 



N^aticopsis Jiumilis, Meek. 

 " levis, Meek. 

 " aequisiriata, Meek. 

 " cretacea, H. and W. 



Genus Loxonema. Phillips. 



Loxonema Hamiltoniae, Hall. 



Genus Isonbma. Hall. 

 t lonema lellatula, Hall. 



Genus Orthonema. Meek and Worthen 

 Orthonema Newberryi, Meek. 



Genus Turbo. Linnaeus. 

 Turbo Shumardi, Yandell. 

 " rotmidata,Jiail, 



Genus Euomphalus. Sowerby. 



Euomphalus De Cewi, Billings. 



Genus Pleurotomakia. Defrance. 

 Pleurotomaria Liicina, Hall. 

 " Kearneyi, Hall. 



Genus Cyclonema. Hall. 

 Cyolonema crenulata, Meek. 



Genus Murohisonia. De Verneuil. 



Murchisonia Maia, HaU. 



Genus Platyceras. Conrad. 

 Platyceras dumosum, Conr. 



" dumosumvar. attenuatum, Meek. 



" mtdtispinosum, Meek. 



" carinaiiim, Hall. 



" (sp. undescribed) 



Genus Platyostoma. Conrad. 



Flatyostoma Liclias, Hall. 

 " Uneatum, Conr. 



