70 CONTRIBUTIONS 
gations in the sciences, have, at, home and abroad, won 
for him a deserved reputation such as few acquire. 
V. rotunda. Plate 1. Fig. 48. 
Description. Shell rotund, inequilateral, slightly in- 
flated, longitudinally and closely ribbed ; substance of the 
shell rather thick; lunule small, ovately cordate ; beaks 
slightly elevated, recurved ; ribs about twenty-six, and 
furnished with closely set arched scales; teeth rather 
oblique ; cicatrices rather impressed ; cavity of the shell 
somewhat deep and rounded; margin rather largely cre- 
nulate. 
Diam. .6, Length 1, Breadth 1, inch. 
Observations. This fine species is remarkable for its 
beautifully furnished ribs, which are so thickly set with 
arched scales, as almost to cause them to lie over each 
other. It differs from the Sillimani in its form, size and 
ribs. 
V. parva. Plate 2. Fig. 49. 
Description. Shell subtriangular, rounded below, angu- 
lar above, inflated, equilateral, longitudinally and closely 
ribbed ; substance of the shell thick ; lunule large, cordate, 
slightly impressed ; beaks elevated, large; ribs about twenty, 
transversely and thickly crenulate ; teeth oblique; cica- 
trices slightly impressed ; cavity of the shell rather deep ; 
margin largely crenulate. 
Diam. .2, Length .3, Breadth .3, of an inch. 
