SEPARATISTA, MELAPIUM. 213 



Genus SEPARATISTA, Gray. 



The animal is unknown, and the relationships of the genus are 

 doubtful. 



S. GRAYI, A. Adams. 



Shell with the spire depressed, whorls with five transverse 

 keels ; aperture transversely oblong ; inner lip reflexed, anteriorly 



rounded. 



Cape of Good Hope. 

 Xot figured. 



S. CHEMNITZII, A. Adams. PL 68, fig. 398. 



Shell with the spire elevated, whorls with three transverse 

 keels ; aperture subcircular ; inner lip somewhat reflexed, ante- 

 riorly produced and angulated. 



Is le of Burias, Philippines. 



S. LAXA, Say. PI. 68, fig. 399. 



Nearly glabrous ; yellowish-white ; a dilated, rugose groove on 

 the line of the umbilicus. Length, *9 inch. 



Coast of South Carolina. 



Only a single specimen obtained. Mr. Say suggests that it 

 may be a scalariform Natica. May it not rather be a valve of the 

 fossil genus Diceras, one of the Chamidae ? 



S. BLAINVILLEANA, Petit. 



Tricar inated on the body-whorl, bicarinated on the spire ; 

 membranaceous, transparent ; rosaceous under a corneous epider- 

 mis. Length 7*5, diam. 10 mill. 



Marianne Isles. 



Something like S. Chemnitzii, A. Ad., but with more elevated 

 spire. 



Genus MELAPIUM, H. and A. Adams.. 



This genus was instituted for the Pyrula lineata of Lam. ; the 

 animal and operculum of which are unknown. Its systematic 

 position is very doubtful. It has the porcellanous texture of 

 Pusionella ; from which, however, it is distinguished by its ven- 

 tricose body-whorl and short papillary spire. 



M. LINEATUM, Lam. PL 6*7, fig. 395- 



Smooth, porcellanous, yellowish-white, longitudinally streaked 

 with brown ; columella violet-tinted. Length, 2-2*5 inches. 



Kant Indies. 



