MARINE MOLLUSCA OF THE UNITED STATES. 43 



deeper shade, teeth and wrinkles of mouth white, interstices and 

 interior deep purple-brown. 



Length 6, diam. 4 inches. 



North Carolina to West Indies. 



2. C. GHANULOSA, Bruguire. Fig. 68. 

 Encyc. Metli., No. 5. 1792. 



Shell somewhat globosely ovate, rather thin, extremity ventri- 

 cose, spire sharp; whorls rounded, inflated, smooth, transversely 

 obsoletely grooved, reticulately striated towards the apex ; colu- 

 mella smoothly plicated and conspicuously granose ; lip reflected, 

 thickened and dentate within. Bluish-white, encircled by five 

 bands of somewhat square and irregularly interrupted reddish- 

 brown spots. 



Length 4, diam. 2j inches. 



North Carolina to West Indies. 



Genus DOLIUM, Lamarck. 



Philos. Zool. 1809. 



Shell thin, roundly oval, ventricose, inflated ; spire small ; whorls 

 transversely furrowed; aperture very large, with a short, poste- 

 rior reflected canal ; inner lip thin, widely expanded ; outer lip 

 fimbriated or crenated. No operculum. 



About twenty species ; distribution tropical. 



1. D. GALEA, Linnaeus. Fig. 69. 



(Buccinum.) Syst. Nat., edit. xii. 1197. 1767. 



Shell very large, extremely ventricose, umbilicated ; spire short, 

 a little sunk in ; sutures deeply impressed ; whorls seven in num- 

 ber, swollen around the upper part, with revolving ribs ; ribs con- 

 vex, close-set, upper ones with most frequently an intervening 

 ridge ; columella somewhat twisted ; whitish or pale fulvous, apex 

 blackish, columellar lip white, lip stained with brown. 

 Length 8, diam. 6 inches. 



North Carolina to W. Indies ; Mediterranean. 



2. D. PERDIX, Linnaeus. Fig. 70. 



(Buccinum.) Syst. Nat., edit. xii. 1197. 1767. 

 Dolium plumatum, Green, Trans. Albany Inst., i. 131. 1830. 



Shell ovately oblong, thin, inflated, obliquely effused towards 

 the base, umbilicated; spire somewhat exserted ; whorls six in 

 number with revolving ribs and grooves ; ribs about twenty in 

 number, contiguous, flatly convex, scarcely raised ; columella 



