154 CANTIIARUS. 



C. SPIRALIS, Gray. PL 73, figs. 242, 243. 



White, more or less marbled with reddish brown ; covered by 

 a dark brown, sparsely pilose epidermis. Length, 1*5 inches. 



Mauritius. 



BuccinUm Prevostii, Val. (fig. 243), is evidently a synonym. 



C. TRANQUEBARICUS, Gmel. PI. 73, fig. 244. 



White, or with the revolving ridges sometimes reddish, under 

 a thin, light brown epidermis ; margin of aperture sometimes 

 tinged with orange. Length, 1*5 inches. 



Tranquebar. 



The shoulder of the whorls is more convex, the longitudinal 

 ribs are more numerous and narrower and extend over the spiral 

 whorls, where they are obsolete in C. spiralis : the revolving- 

 lines which take the place of the more sharply defined and less 

 numerous revolving ribs and sulci of spiralis will also serve to 

 distinguish the two species. 



C. MELANOSTOMA, Sowb. PL 73, tig. 245. 



Orange-brown, usually interruptedly stained with darker color 

 on the longitudinal ribs. Aperture white, with an orange-brown 

 lip and chocolate columella. Length, 1*5-2*25 inches. 



This species was confounded by Kiener and others with C. 

 Tranquebaricus, from which it differs not only in its greater size 

 and solidity, and in coloration, but in its wider, cord-like revolv- 

 ing ribs and more apparent shoulder, 



C. IOSTOMA, Gray. 



Shell ovate, solid, dark brown, closely spirally striated, slightly 

 longitudinally plaited, covered with a thin, hairy periostracum ; 

 spire short conical ; last whorl subangular and nodulose behind. 

 Mouth ovate, large, black ; throat purple, grooA'ed ; outer lip 

 crenulated ; inner lip rather expanded, and strongly veined. 



Length, 1/5 inches. 



Pacific Ocean. 



The above is the original description : the species has not been 

 figured nor recognized by subsequent authorities. It has some 

 affinity with melanostoma, and may possibly be a form of that 

 species. 



