440 GEOLOGY OF OHIO. 



CRUSTACEA. 



Daemania Emmerich. 



D. Calypso Hall. 



D. Helena Hall=Z?. Ohio ens e Meek. 



D. selenurus Green. 

 Phacops Emmerich. 



P. rana Green. 

 Proetus Steininger. 



P. crassimarginatus Hall. 



Species prom above the Bone-Bed. 

 CRINOIDEA. 



GONIASTEROIDOCRINUS I^yon. 



G. spinigerus Hall. 

 BRACHIOPODA. 



Linguea Brugiere. 



L. Manni Hall. 



L.ligea Hall. 

 Discina Lamarck. 



D. Lodensis Hall. 



D. minuta Hall. 

 Strophomena Rafinesque. 



S. rhomboidalis Wilck. 

 Chonetes Fischer. 



C. scitula Hall. 



C. reversa Whitf. 

 Spirifera Sowerby. 



5". Maia Billings. 



6". zic-zac Hall. 



IvEIORHYNCHTJS Hall. 



L. limitaris Vanuxem. 



LAMEUJBRANCHIATA. 



Avicueopecten McCoy. 



A. equilaieras Hall. 

 Pterinea Goldfuss. 



P. simitis Whitf. 

 Actinodesma Sandberger. 



A. subrectum Whitf. 

 Grammysia DeVern. 



G. bisulcata Conrad. 

 Nyassa H. and W. 



N. argnta H. and W. 



