70 CONTRIBUTIONS 



gallons 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. 



