24 



LIMNEA UMBROSA, Say. 



Plate 7. 



L. testa elongata, ventricosa, fusca: spira attenuata, 

 acuta: anfractibus senis, convexiusculis, transvcrsim minu- 

 tissime striatis: apertura semicirculari; labro repando. 



SYNONYMS AND REFERENCES. 



Limneus elongatus, Say. Journ. Acad. Nat. Sci., vol. 



ii. p. 1G7. 

 Limneus umbrosus, Say. Amer. Conchology, pi. 31. 



fig. 1. 



DESCRIPTION. 



Shell lengthened, ventricose, composed of 

 six slightly convex whirls, of which the anterior 

 one is somewhat inflated: surface covered with 

 numerous minute transverse spiral lines: suture 

 oblique, with little depth, but well marked: 

 spire attenuated, with the apex acute: fold on 

 the columella not well marked: aperture wide, 

 nearly straight on the inside, wide anteriorly; 

 less than half the length of the shell: body 

 whirl above, longer than half the entire length. 



