SEPARATIST A, MELAPIUM. 213 



Genns 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. PI. 68, fig. 398. 



Shell with the spire elevated, whorls with three transverse 

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

 riorly produced and angulated. 



Isle 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 Chamidse? 



S. BLAINVILLEANA, Petit. 



Tricarinated on the body-whorl, bicarinated on the spire ; 

 membranaceous, transparent ; rosaceous under a corneous epider- 

 mis. Length 1*5, diam. 10 mill. 



Marianne Isles. 



Something like S. Ghemnitzii, 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. PI. 67, fig. 395- 



Smooth, porcellanous, yellowish-white, longitudinally streaked 

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



Kant Indies. 



