LIMN^A. 89 



3. LIMNiEA CASTA, Lea. 

 Plate 16, figs. 3, 4, 5. 



Shell subfusiform, narrow, whorls very ob- 

 lique, flattened, thin, imperforate ; whorls five, 

 spire narrow, pointed ; aperture narrow-ovate, 

 effuse below. Light horn color. 



Length 15, diam. 8 mill. 



Rhode Island, Ohio, Georgia. 



This shell is much narrower and more ob- 

 lique than columella. Fig. 3 represents a spe- 

 cimen from Georgia, which I consider typical 

 in its form ; fig. 4 is an outline of the type of 

 Dr. Lea's L. strigosa, and fig. 5 represents L. 

 coarctata, Lea, the latter founded on a mon- 

 strosity of frequent occurrence in all the spe- 

 cies of Limncea, — namely, an angulated instead 

 of a rounded periphery. 

 (63) 



