LiinBaiaaea lepida, Gould. — Shell very fragile, elongated, very 

 acutely conical, subumbilicate, pale horn-color; whirls five, oblique, 

 moderately convex, forming an acuminated .spire ; suture moderately im- 

 pressed; surface smooth and shining, lines of growth faint, and when ex- 

 amined by a magnifier they are found to be rendered somewhat zigzag by 

 distant, revolving furrows, which cross them. Aper- 

 ture large and expanded, nearly semicircular, half pj„ 33 

 the length of the shell ; outer lip expanded ; colu- 

 mella having a very strongly marked sharp fold, and 

 broadly covered with a thin callus, which not being 

 closely appressed at the umbilical region, leaves a 

 small chink. Length |, breadth ^ inch. 



Lake Vancouver, Oregon. 



Most closely allied to L. pallida, Adams, but is 

 much more delicate, the spire more acuniinate, the Limnma lepida. 



aperture larger and expanded, the fold of the pillar 



more developed, and the surface well characterized, when closely examined) 

 by the flexuose lines. The whirls are much more oblique and less convex 

 than in L. desidiosa. (Gould.) 



Limnxa lepida, Gould, Proc. Boston S. N. H. II, 211 (1847) ; U. S. Ex. 

 Ex. Moll. 121, f. 141, 141a (1852) ; Otia, 41. 



The description and figure given above are both copied from 

 Dr. Gould. The original specimens are preserved in the Smith- 

 sonian collection. 



