PURPURIFERA. MOLLUSC A. BUCCINUM. 311 



Nassa vibex, SAY; Journ. Jlcad. JYa*. Sc., ii. 231. Atn.tr. Conch., pi. 57, f. 2. 

 Buccinum vibex, ADAMS; Bost. Journ. Nat. Hist., ii. 204. 



Shell solid, short ovate-conic, of an ashy-white color ; whorls 

 six, suture very fine ; body whorl with about twelve undulating 

 folds or ribs, crossed by about ten elevated lines, most distinct on 

 the ribs ; the space between the two upper lines is more deeply 

 indented, forming pits between the ribs ; a pale-reddish zone en- 

 circles the top, the middle, and generally the base, of this whorl, 

 the upper one and the ribs being continued to the apex ; aperture 

 oval, outer lip thickened without and within, with four or five 

 teeth within ; pillar very concave, callus abundant, with a few 

 granules at its termination ; canal very short, separated from the 

 body by a furrow. Length J inch, breadth T \ inch, diver- 

 gence 67. 



Specimens of this shell are rare, and usually have a chalky as- 

 pect. They have been found only to the south of Cape Cod. 

 Mr. Say had it from South Carolina ; and I have specimens of a 

 shell from the Spanish Main which differ only in the greater de- 

 velopement of callus and brighter colors. 



BU'CCINUM ROSACEUM. 



Shell small, acutely conic, white, tinged with rose-color ; whorls 

 six, covered with spiral lines ; aperture ovate, shorter than the spire, 

 pillar arched and flattened, lip sharp, and without teeth within. 



FIGURE 195. 

 State Coll., No. 4. Soc. Cab., No. 2379. 



Buccinum roskceum, GOULD ; Silliman's Journ., xxxviii. 197. 



Shell small, elongated, acutely conic, white, tinged with rose- 

 color, closely covered with minute revolving lines, most con- 

 spicuous near the base of the shell, in most parts microscopic ; 

 lower whorl as long or longer than the rest of the spire ; suture 

 faintly impressed, but distinct ; aperture about two fifths the length 

 of the shell, narrow-ovate ; outer lip sharp, a little everted, 

 smooth within, gently curving to its junction with the spire ; 

 pillar arcuated, a little flattened, smooth and white. Length -| T 

 inch, breadth $ inch, divergence 40. 



