622 GEOLOOl OF OHIO. 



Genus Spiripera.. Sowerby. 



Spirifera acuviinaia, Conr. 

 " duodenaria, Hall. 

 " euryteines, Owen. 



" 'finibriata, Conr. 

 " gregaria, Clapp. 



Grieri, Hall. 

 " macta, Hall. 

 " maoronoia, Hall. 

 " macroihyns, Hall. 

 " maia, Billings. 

 " Manni, Hall. 

 " mucronala, Conr. 

 " Oweni, Hall. 

 " varicosa, Hall. 



Genus Spiriferina. D'Orbigay. 



Spirifenna raricosta, Conr. 



Genus Meristella. Hall. 



Meristella nasuta, Conr. 

 " sdiula, Hall. 



Genus Cyrtina. Davidson. 

 Cyriiiia Samiltonensis, Hall. 



Genus Nucleospika. Hall. 



Nucleospira concinna, Hall. 



Genus Athykis. McCoy. 



Aihyris spiriferoides, Eaton. 

 " viUata, Hall. 



Genus Atrypa. Dalman. 



Atrypa reticularis, Dalm. 

 " aspera, Schl. ? 



Genus Rhynchonblla. Fischer, 

 Bhynchonella Carolina, Hall. 



Genus Pbntamerus. Sowerby. 

 Pmtamerua aratus, Hall. 



Gbnus Orthis. Dalman. 

 OrtMs Vanuxenii, Hall. 

 " propingua, Hall. 



Genus Strophomena. Eafinesque. 

 Stropjwmena rhomboidalis, Wahl. 



Genus Stropkodonta, Hall. 

 Strophodonta Jiemispherica, Hall. 

 " demisaa, Conr. 



