AS GENUS BUCCINUM. 
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 
Buccinum. 
(Collect. Mass. Lam.) 
Pl. XVII, fig. 60. 
B. testa ovato-conica, apice peracuta, levi, basi striata, pallide rubente ; 
anfractibus supeine 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 strie. Aperture ovate, elongated, of a 
whitish color. Right lip rounded, striated internally ; colu- 
mella arched and smooth. 
J 
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. . 
