418 



aEOLOGY OF OHIO. 



Spirifer plioal ella — var. radiata '. Hall. 



Streptorhynchus subplana Conr. 



Strophodonta striata. 



Strophomeua rhomboidalis Wickl. 



Trimerella graudis Bill. 



Trimerella Ohioeusis Meek. 



LAMELLIBKANOHS OR BIVALVES. 



Amphicoolia (Leptodomns) costatiis H. and W. 



Megalomns Canadensis Hall. 



GASTEROPODS OR UNIVALVES. 



Holopea — -undetermined sp. 



Murcbisouia Lapbami Hall. 



'■ macrospina Hall. 



Platyceras Niagareuse Hall. 



Platyostoma Niagareuse, var. trigouoBtoma Meek. 



Pleurotomaria Halei Hall. 



Hoyi HaU. 



idia HaU. 



" occidens Hall. 



Straparollus mopsus Hall. 



" Niagarensis H. and W. 



Subulites teretiformis H. and W. 



Tremanotus Alpbeus Hall. 



' ' (Bucaaia) trigonostoma H. and W. 



Trocbonema jjauper, var. Obioensia H. and W. 



CEPHALOPODS OR CB.4.MBERED SHELLS. 



Actinoceras — undeterrain«d sp. 



Cyrtoceras dardanum Hall. 



" ellipt.icum H. and W. 



" brevioorne Hall. 



" Herzeri H. and W. 



" myricef Hall. 



Litaites Marsbii HaU. 



" Ortoni Meek. 



Nautilus — undetermined sp. 



Ortboceras abnorme Hall. 



" annulatum .* Sowerby. 



" crebescens Hall. 



Phragmoceras ellipticum H. and W. 



" parvum H. and W. 



Troohooeras Desplainense HaU. 



