62 Bulletin 12 190 



Orbiculoidea doria (Hall) x 



Clark county (Nettleroth). 



Orbiculoidea minuta (Hall)? 



Lebanon, Ky. 



^Orbiculoidea seneca (Hall) x 



Charlestown. 



Orthothetes chemungensis ardlostriatus 



Hall :.: X 



Rare. Falls of the Ohio, Lancaster, 



Scipio, Kent, Bear Grass creek, Louisville. 



*Orthothetes crenistria (Phillips?) 



Rather common. Low Gap Ridge, Bar- 

 tel, Borden, Ind., Brooks, Riley's, and 

 Parksville, Ky. 



*Orthothetes umbraculum Hall and Clark.. 

 New Providence, Ind., 12. 



Parazyga hirsuta Hall x 



Bunker Hill, 17, Falls of the Ohio (Net- 

 tleroth). 



Pentamerella arata (Con.) x 



Rare. Clark county. Falls of the Ohio 

 (Hall). 



Pentamerella pavilionensis Hall x 



Falls of the Ohio (Nettleroth). 



Pentamerella thusnelda Nettleroth x 



Falls of the Ohio (Nettleroth). 



*Pentagonia unisulcata (Con.) x 



Falls of the Ohio (Nettleroth). 



Pholidostrophia iowensis Owen ; x 



Falls of the Ohio (Nettleroth). 



Produdlus alternatus N. and P 



Rare. Parksville, Ky. 



Produdlus arcuatus Hall ? ' . 



A common species at Pixley Knob, Ind. 



Produdlus burlingtonensis Hall 



Common. Brooks and Riley's, Ky, 



