154 CANTHARUS. 



C. SPIRALIS, Gray. PL 13, figs. 242, 243. 



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

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



Maurithis. 



Buccinum Frevostii^ Yal. (fig. 243), is evidently a synonym. 



C. Tranquebaricus, Gmel. PI. 13, fig. 244. 



White, or with the revolving ridges sometimes reddish, under 

 a thin, light brown epidermis ; margin of aperture sometimes 



tinged with orange. Length, l-.o inches. 



- Tranqucbar. 



The shoulder of the whorls is more convex, the longitudinal 

 ribs are more numerous and narrower and extend over the spiral 

 whorls, where they arc obsolete in G. spiralis: the revolving 

 lines which take the place of the more sharpl}- defined and less 

 numerous revolving i-ibs and sulci of spiralis will also serve to 

 distinguish the two speci(;s. 



C. MELANOSTOMA, Sowb. PI. 13, lig. 245. 



Orange-brown, usually interruptedly stained with darker color 

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



lip and chocolate columella. Length, r5-2*25 inches. 



■ Geyloru 

 This species was confounded b}^ Kiener and others with G. 

 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 apparenfshoulder. 



C. losTOMA, Gra}'. 



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, grooved ; 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. 



