PALUDINA DECISA. 5 



last more finely clotted: tentacles dark above; 

 eyes black and conspicuous: foot translucent, 

 very large anteriorly, ending square, but slightly 

 emarginate in the centre: rostrum small, and 

 scarcely projected beyond the edge of the shell. 

 The centre of the under surface of the foot is 

 marked with light reticulated lines, which are 

 radiated towards the edaes. 



Shell thin, subconic, and polished, with six 

 convex whirls: spire lengthened, having the 

 apex rounded: aperture wide and pyriform; 

 labrum meeting the body whirl at an angle: 

 suture deep: lines of growth very fine: spiral 

 strise minute or obsolete. 



Color of the shell bright green, or yellowish- 

 green; inside bluish-white. 



Geographical Distribution. The streams 

 of New Jersey, the Delaware, Schuylkill, and 

 rarely, the Susquehanna. Common throughout 

 New England, Dr. A. A. Gould. Ohio, J. G. 

 Anthony. "The species is very common in 

 various parts of the Union," — Say. Dr. Wm. 

 Blanding has given me specimens which he 

 collected from the Mississippi in Iowa Terri- 

 tory, and from Fox river, between Galena and 

 Chicago. It occurs in the Nolachucky and 



