MOLLUSCA OR UNIVALVES. 249 



almost square, and disposed in transverse rows 

 near one another. 



Mr. Broderip has separated some shells from 

 the genus Voluta under the names of Melo and 

 Cymba. Their generic distinctions will be 

 understood by the following descriptions. 



115. Melo (Broderip). — Shell light, ventri- 

 cose, oval, with a light greenish- 

 brown epidermis ; spire short, re- 

 gular, sometimes hidden by the 

 last whorl ; aperture large, nearly 

 as long as the whole shell ; outer 

 lip thin; columella slightly curved, 

 with four or five oblique pro- 

 minent plaits. 



The aperture of this shell is much larger 

 than that of Voluta, and the shell and outer 

 lip are thinner. They are very beautiful, and 

 of a large size. 



116. Cymba (Broderip). — Shell smooth, 

 ventricose, with a short rounded spire ; a 

 very large wide aperture, terminating at the 

 upper part in a flat ledge, which separates the 

 outer lip from the body whorl ; columella with 

 three or four oblique projecting folds, ter- 



