48 G E N TI p B U C O I N IT M . 



described, so as to present the most natural series of groups or 

 sections, which we can possibly form. In this manner, we shall 

 indicate with clearness, the gradations by which we are led from 

 one genus to another, as determined by the affinities which the 

 animals and the principal characters of the shell present. 



47. BUCCINUM SEMICONVEXUM, LAM. The Semi-convex 



Buccinwn. fj. . t . . 



(Collect. MASS. LAM.) 

 Pi. XVII, fig. 60. 



B. testa ovato-conica, apice peracuta, Isevi, basi striata, pallide rubente; 

 anfractibus super no fusco maculatis, duobus infimis convexis, superioribus 

 planulatis; labro intus dentato. 



Shell ovate, conical, very pointed at its summit, of a pale 

 red, often ornamented with longitudinal waved and distant 

 bands ; sometimes elongated spots appear upon the whirls of 

 the spire, which are eight or nine in number; the lowest are 

 convex. The base of the shell is marked with very fine, and 

 very approximate strise. Aperture ovate, elongated, of a 

 whitish color. Right lip rounded, striated internally ; Colu- 

 mbia arched and smooth. 



Length 9 lines. Width 4 lines. 

 Inhabits 



This shell is nearly allied to the BUCCINUM corniculatum ; it 

 differs, nevertheless, in several points ; it is larger, more ventri- 

 cose, and the lowest whirl of the spire is more convex, and 

 slightly depressed at its upper part. 



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