440 GEOLOGY OF OHIO. 



CRUSTACEA. 



Dalmania Emmerich. 



D. Calypso Hall. 



D. Helena Hall=Z>. Ohioense Meek. 



D. selenurus Green. 

 Phacops Emmerich. 



P. rana Green. 

 Proetus Steininger. 



P. crassimarginatus Hall. 

 i 

 Species from above the Bone-Bed. 



CRINOIDEA. 



GONIASTEROIDOCEINUS I^yon. 



G. spinigerus Hall. 

 BRACHIOPODA. 



Ijngula Brugiere. 



L. Manni Hall. 



L. ligea Hall. 

 Discina I^amarck. 



D. Lodensis Hall. 



D. minuta Hall. 

 Strophomena Rafinesque. 



.S. rhomboidalis Wilck. 

 Chonetes Fischer. 



C. scitula Hall. 



C. reversa Whitf. 

 Spirifera Sowerby. 



,S. Maia Billings. 



5*. zic-zac Hall. 



I/EIORHYNCHUS Hall. 



L. limitaris Vanuxem. 

 I/AMEI/WBRANCHIATA. 



Aviculopecten McCoy. 



A. equilalerus Hall. 

 PTERINEA Goldfuss. 



P. similis Whitf. 

 Actinodesma Sandberger. 



A. subrectum Whitf. 

 Grammysia DeVern. 



G. bisulcata Conrad. 

 Nyassa H. and W. 



N. arguta H. and W. 



