624 GEOLOGY OF OHIO. 
GENUS PoRCELLIA. Léveillé. 
Porcellia Sciota, Hall. 
GENUS NYASSA. 
Nyassa arguta. 
GENUS GRAMMYsSIA. DeVerneuil, 
Grammysia secunda, Hall. 
si bisulcata. (?) 
, GASTEROPODS. 
(Univalve Shells.) 
GENUS NatTicopsis. McCoy. 
Vaticopsis humilis, Meek. 
af levis, Meek. 
sf aequistriata, Meek. 
oa cretacea, H. and W. 
GENUS LOXONEMA. Phillips. 
Laxconema Hamiltoniae, Hall. 
GENUS ISONEMA. Hall. 
isonema bellatula, Hall. | 
GENUS ORTHONEMA. Meek and Worthen 
Urthonema Newberryi, Meek. 
GENUS TURBO. Linnaeus. 
Turbo Shumardi, Yandell. 
‘¢ rotundata, Hall. 
GENUS EUOMPHALUS. Sowerby. 
> 
Euomphalus De Cewi, Billings. 
GENUS PLEUROTOMARIA. Defrance. 
Pleurotomaria Lucina, Hall. 
ne Kearneyt, Hall. 
GENUS CYCLONEMA. Hail. 
Cyclonema crenulata, Meek. 
GENUS MURCHISONIA. De Verneuil. 
Murchisonia Maia, Hall. 
GENUS PLATYCERAS. Conrad. 
Platyceras dumosum, Conr. 
‘¢  dumosumvar. attenuatum, Meek. 
« ~—multispinosum, Meek. 
<  carinatum, Hall. 
« (sp. undescribed) 
GENUS PLATYOSTOMA. Conrad. 
Platyostoma Lichas, Hall. 
96 lineatum, Conr. 
