PURPURIFERA. MOLLUSCA. BUCCINUM. 303 



are both lighter and darker than those of the second group. It is in 

 the first group only that I have met with the banded varieties. These 

 have the portion next the suture, the base, and a centi'al zone dark, 

 and the remainder white ; and they constitute Lamarck's species 

 hizonulis. Kiener has figured many varieties, but it would be impos- 

 sible to represent every aspect of a shell, in which no two individuals 

 may be found exactly alike. 



Kiener states that the animal, which is perfectly white, is very car- 

 nivorous, and that by it are produced, principally, the perforations so 

 frequently observed in bivalve shells on the shore. This remark might 

 apply to many of the perforated univalve shells ; but it would hardly be 

 expected that this animal, whose residence is confined to the rocks, 

 should feed upon the animals of bivalve shells, which reside only in 

 sand or mud. The Na'tica is the more probable depredator in this 

 case. 



/ 

 Genus BUCCINUM, LixN. 



Shell ovate-conic ; aperture having a notch ivithout a canal^ in 

 front ; pillar not flattened, someivhat twisted. 



Bu'CCINUM PUCOSUM. 



Shell oval, tapering at both ends, ash-colored, or reddish-brown, 

 with ten or twelve undulations on the lower lohorl, crossed by numer- 

 ous revolving lines. 



Figure 213. 

 State Coll., No. 19. Soc. Cab., No. 313. 



Fusus cinereus, Say ; Journ. Acad. JVat. Sc, ii. 23G. Jlmer. Cunch., pi. 29. 

 Buccinum plicosum, Menke. 



Shell long-oval, tapering at both ends, coarse, solid, of a red- 

 dish-brown color, more or less dark, covered with an ashy-gray 

 pigment ; on some specimens are two faint brown bands on the 

 larger whorl ; whorls five or six, convex, compressed about the 

 suture, with ten or twelve rib-like undulations along each, crossed 

 by numerous, somewhat regular, elevated, revolving lines ; aper- 

 ture ovate, and, with the beak, about equals the spire ; outer lip 

 sharp, scolloped by the termination of the revolving lines, with 

 one or more series of elevated, whiter lines within, corresponding 

 to the external grooves ; pillar margin slightly arched, covered 



