194 AMERICAN JOURNAL 



gitudinal ribs ; apex entire ; aperture suboval, small, peristome 

 continuous, labium reflexed and prominent. 



This may be only a subgenus of the former, but the shell has 

 more general resemblance to Pupa and is without an umbilicus. 

 The aperture is proportionally smaller. 



L. LAQUEATA, Conrad, — PI. 10, fig. 3. 



Subcylindrical, whorls 8, rounded, with oblique, thick, rounded, 

 longitudinal ribs, which on the last whorl extend to the line of 

 the angle of the mouth. The first and second whorls from the 

 apex entire. 



The figure is intended merely to indicate the size and propor- 

 tions of the shell. 



These two shells probably belong to the family Melaniidce. 



EBORA, Conrad. 



Turbinate, columella much arched ; peristome continuous, 

 thickened; nperture notched at base. 



This small shell is solid, and four specimens umbilicated, but 

 one, the largest, is closed. I presume this to be a fresh water 

 genus, but have no means of proving it. 



E. CRASSILABRA, Conrad. — PL 10, fig. 14. 



Turbinate, spire short, consisting of 4 whorls, which are 

 rounded and smooth; last whorl broad and rounded. 



Subgenus Nesis, Conrad. 



Turbinate, with prominent revolving ribs ; umbilical channel 

 wide, extending to the base ; labrum not thickened, slightly re- 

 flexed. 



E. BELLA, Conrad. — PI. 10, fig. 17. 



Last whorl with 7 prominent revolving ribs, the intermediate 

 spaces concave ; spire consisting of 4 volutions, flat towards 

 the apex, and having two ribs on each except the apicitU whorl 

 and the adjacent one, which are smooth; the apicial whorl is 

 well defined but minute. 



HEMISINUS, Swainson. 



H. SULCATUS, Conrad. — PI. 10, fig. 2. 



Subulately turbinated, solid, polished, whorls slightly convex, 

 revolving grooves or impressed lines not closely arranged, about 

 six on the penultimate whorl, and two minute lines, one towards 

 each boundary ; last whorl with about 23 lines, which reach the 

 base. 



