207 Devonian of Southern Indiana 79 



Platystoma turbinatuin Hall x 



Falls of the Ohio (Nettleroth). 



Plat3'stoma tnrbinatum var. cochleatum H.. x 

 Louisville, Ky. (Nettleroth). 



=^Pleu ronotus decewi Billings x 



Falls of the Ohio. 



Pleurotomaria sp 



An iinfigured species occurs abundantly 

 in the sandstone at Borden and Low Gap 

 Ridge, Ind. 



Pleurotomaria arabella Nettleroth x 



Clark county (Nettleroth). 



^Pleurotomaria imitator Hall x 



Charlestown. 



*Pleurotamaria lucina Hall x 



Charlestown and Bartholomew county. 



^Pleurotomaria lucina var. perfasciata Hall x 



Falls of the Ohio, Clark county (Nettle- 

 roth). 



Pleurotomaria mitigata Hall 



Rockford (James Hall). 



Pleurotomaria prodleri Nettleroth x 



Clark county (Nettleroth). 



^Pleurotomaria sulcomarginata Con x 



Rare. Falls of the Ohio (Nettleroth). 

 Lancaster, Ind. 



Pleurotomaria textiligera Meek 



Knobstone, Washington county (Gorby). 



Pleurotomaria vadosa H 



Rockford (James Hall). 



Polyphemopsis sp 



Rare. Pixley Knob, Ind. 



Polj'phemopsis louisvillse H. and W x 



Falls of the Ohio (Nettleroth). 



*Straparollus lens Hall 



Rockford (Hall). 



