622 GEOLOGY OF OHIO. 
GENUS SPIRIFERA. Sowerby. 
Spirifera acuminata, Conr. 
‘¢  duodenaria, Hall. 
‘6 euryteines, Owen. 
‘¢  fimbriata, Conr. 
‘fs gregaria, Clapp. 
‘Ss Grieri, Hall. 
‘¢ smacra, Hall. 
‘¢ ~~ macronota, Hall. 
ss macrothyris, Hall. 
“  maia, Billings. 
‘¢—s Manni, Hall. 
6 mucronata, Conr. 
‘6 Oweni, Hall. 
sé -varicosa, Hall. : 
GENUS SPIRIFERINA. D’Orbigny, 
Spiriferina raricosta, Conr. 
GENUS MERISTELLA. Hall. 
Meristella nasuta, Conr. 
‘© scitula, Hall. 
GENUS CyRTINA. Davidson. 
Cyrtina Hamiltonensis, Hall. 
GENUS NUCLEOSPIRA. Hall. 
Nucleospira concinna, Hall. 
GENUS ATHYRIS. McCoy. 
Athyris spiriferoides, Katon. | 
‘6 vittata, Hall. 
. GENUS ATRYPA. Dalman. 
Atrypa reticularis, Dalm. 
« aspera, Schl. ? 
GENUS RHYNCHONELLA. Fischer. 
. Rhynchonella carolina, Hall. 
GENUS PENTAMERUS. Sowerby. 
Pentamerus aratus, Hall. 
GENUS ORTHIS. Dalman. 
Orthis Vanuxemi, Hall. 
‘6 propinqua, Hall. 
GENUS STROPHOMENA. Rafinesque. 
Strophomena rhomboidalis, Wahl. 
GENUS STROPHODONTA. Hall. 
Strophodonta hemispherica, Hall. 
af demissa, Conr. 
