32 PROCEEDINGS OF THE ACADEMY OF 



CYCLOCHEILA, Conrad. 



P3'raniiclal, aperture circular, expanded labrum widely reflexed, 

 columella flattened, subangular at l)ase. 



C. Pebasana, Conrad, PI. I., fig. 17. 



Volutions 5, with straight sides; last volution angular and 

 carinated on the angle; base flattened; spire and mouth of nearly 

 equal length, spire longest; lines of growth oblique. 



HEMISINUS, Swainsou. 

 H. Steerei, Conrad, PI. I., fig. 14. 



Turreted; volutions 6, convex, showing remains of 3 carina- 

 tions on each one of the spire ; last volutions having 4 revolving 

 carinated lines, the upper one near the suture ; sinus of labrum 

 deep. 



A single specimen occurs, much water-worn, almost obliterating 

 the carinated lines of the spire. 



EBORA, Courad. 

 E. crassilabra, Conrad, PI. I., fig. 9. 



Notes. LiRis LAQUEATA, Courad, appears to me to be a land 

 shell allied to Cylindrella and Clausilia. There are, I think, 

 five genera of land shells and three of fresh water, with four 

 species of the latter. A few fragments of fish remains (Mylio. 

 bates) were determined by Prof. Leidy, and there is an impress in 

 the clay of nearly a whole crab. It is remarkable that no remains 

 of plants have been found where delicate fresh-water and land 

 shells have been drifted into these deposits. We ma}'^ expect to 

 find mammalian relics when the beds are more thoroughly ex- 

 plored, and they would be likely to indicate their geological age. 



