NATURAL SCIENCES OF PHILADELPHIA. 43 



C. pulchella Sow. and C. Jaspidea Sow., of West Indies ; this species being more 

 elongated. 



A single specimen obtained from the stomach of a blackfisb, off Charleston 

 bar. 



COLUMBELLA NIVEA. 



Shell small, delicate, elongated-conic, white, immaculate, smooth, polished, 

 prettily striated on the outer part of the canal, lower whorl longer than the 

 spire, suture distinct, with one white revolving line a little below it on the 

 whorls, like a double suture; pillar covered with callus, much hollowed, sud- 

 denly becoming straight to form the canal ; callus ends in a distinct edge ; 

 outer lip a little thickened, sparsely denticulated within, the posterior tooth 

 being decidedly the most prominent. 



This is a pretty little shell, allied to Buccinum rosaceum Gould, and C. lunata 

 Say. 



A single specimen was taken from the stomach of a fish off Charleston bar. 



Nassa consensa. 



Shell ovate-conical, ribbed and crossed by numerous revolving strias ; whorls 

 7, and the apex ; whorls rounded, with eleven strong ribs ; suture deep. Scol- 

 loped by the ribs ; revolving striae crossing the ribs, as well as the interstitial 

 spaces. 



Aperture nearly oval, outer lip much thickened, denticulate within, the lar- 

 gest tooth being in the form of a ridge ; next the canal ; pillar much hollowed ; 

 with slight callus above, which is much thickened to form the canal, canal 

 short oblique, turned backwards ; the lower portion of the pillar which turns 

 out of the aperture to form the canal is quite white with crowded, incon- 

 spicuous, revolving stria? ; on the pillar at the edge of the canal there is one 

 deep groove. 



Color of the shell generally yellowish-brown, with a narrow deep brown 

 band immediately next the white projection at the canal ; next to this, on the 

 body whorl, is a much wider band of lighter brown, which revolves at the 

 suture to the apex of the shell ; all other portions of the shell are marked by 

 delicate lines more or less grouped, of yellowish-brown. On the thickened 

 portion of the outer lip these lines are here and there more deeply colored in 

 spots. 



This is a very pretty shell ; a single specimen was found in a fish off Charles- 

 ton bar; 14 fathoms. 



It resembles N. incrassaia of England, and we have seen it in collections 

 labelled " N. ambigua Moret, West Indies." 



DRtLLA ELOZANTHA. 



Shell robust, conico-cylindrical, with ten whorls, which are bi-carinate, by 

 being deeply grooved immediately above the suture, and again in the upper 

 half of the whorl. The ridge left between these grooves is ornamented by ten 

 strong, yellow, smooth, shining tubercles ; the upper edge of the whorl is 

 again bevelled, forming the second carina, which is not at all nodulous. 

 Below the nodulous carena on the body whorl, there are obsolete ribs, crossed 

 by four nodulous ridges, the first touching the tubercles of the principal carina; 

 below these there are eight others, some of which are obscurely nodulous ; on 

 all parts of the shell not occupied by the tubercles or carina, there are numer- 

 ous fine equidistant stria?, requiring the glass to bring them to view. 



The aperture small, outer line made oblique by the deep sinus of the thick 

 outer lip, just below the suture ; the pillar is nearly straight, with a strong 

 callus, the edge of which is thick and well defined. 



Color deep brown, generally, becoming a little lighter from the tubercles to 

 the suture, embracing the upper carina; near the extremity of the canal there 

 is a lighter colored band, taking in three of the ridges; beyond that to the 

 extremity is again almost black. This shell is allied to the "-P. ornata" 



1861.] 



