MARINE MOLLUSCA OF THE UNITED STATES. 31 



mella with a broad callus, somewhat flattened and twisted at its 



lower portion ; not extending so far as the lip on the opposite 



side of the canal. 



Length 15, diam. 47 mill. 



Neio Jersey (rare), nortJitcdrds. 



This is the American prototype of the B. undatum of Europe, 

 which it closel}' resembles. It is distinguished by the following 

 differences: the whorls are more convex, the spire is shorter, and 

 the diameter of shell propoi'tionally greater ; the aperture is smaller 

 and more circular; the sinus of the outer lip is broader and shal- 

 lower, and nearer the middle of the lip ; the aperture is (in fresh 

 specimens) golden within, while in undatum it is white or choco- 

 late-colored ; the columella is shorter; the ciliation of the perios- 

 traca is short and sparse, never long and furry as in good speci- 

 mens of the European species; finally, it never reaches the size 

 or number of whorls of the latter. 



4. B. ToTTENi, Stimpson. Fig. 46. 



Review of Northern Bucciuums, p. 23. 1865. 



Dawson, Canad. Nat., ii. 415, t. 7, f. 5. 1857. 

 Buccinum ciliatum (part.), Gould., Invert. Mass. 307. 1841. 



Shell of moderate size, white, thin; spire acute; suture im- 

 pressed; whorls seven, regularly convex, neither carinated nor 

 angulated. Longitudinal folds about twenty-tvvo, ver}'' regular, 

 straight, not at all oblique, and about equalling their interspaces 

 in width, becoming obsolete on the body-whorl except occasion- 

 ally at the suture. Transverse striation sharp and regular, the 

 grooves narrow and deeply cut. The primary ridges are very 

 numerous and crowded, the narrower and less prominent ones 

 usually alternating by threes or fours with the stronger ones. 

 The primary grooves are much narrower than the corresponding 

 ridges. The secondar}'^ grooves are few in number, occurring for 

 the most part only on the greater ridges. Aperture rather broad, 

 half as long as the shell; outer lip thin, effuse, projecting below, 

 with its superior sinus very broad and shallow or obsolete ; folds 

 of the columella little prominent. Periostraca light-yellowish, 

 short-ciliated with triangular fimbriae at the intersections of the 

 growth lines with the transverse striee. Color within the aperture 

 white, or pale-yellowish. 



Length 53, diam. 33 mill. 



Banks of Neiofoundland . 



