1865.] REVIEW OP THE NORTHERN BUCCINUMS. 371 



Longitudinal folds about nine, not oblique, nearly obsolete at the 

 suture, but very prominent near the middle of the body -whorl, and 

 with broad and deeply concave intervals looking as if the shell had 

 been pinched at these points. The primary and secondary spiral 

 grooves are more alike than in the other carinated species preceding. 

 The primary ridges are like those of B. polare and B. glaciale as to 

 number and arrangement, but are much more convex ; while the 

 secondary grooves upon them are very conspicuous, four or five to 

 each ridge, sharply cut, and nearly as deep as the primary grooves. 

 The grooves are occasionally interrupted or waved by the inter- 

 sections of the lines of growth, giving the surface a shagreened ap- 

 pearance. The aperture is a little more than half as long as the 

 shell ; columellar lip much incurved or concave above ; columella 

 longer than in B. glaciale, and projecting below as far as the 

 outer lip does ; outer lip somewhat thickened and reflected, and 

 deeply sinuated just above the angulation of the body-whorl. 

 Periostraca very thin ; not ciliated. 



Length 1.7; breadth 1.2 inch. Dimensions taken from an 

 uncarinated specimen numbered 1777, in the Smithsonian collec- 

 tion. 



The description is drawn up from specimens taken in the Arctic 

 Ocean north of Behring's Straits, by the U. S. North Pacific 

 Exploring Expedition. They occurred at a depth of twenty-five 

 fathoms. None of them are as strongly angulated or carinated as 

 the immature example figured by Gray; but there can be little 

 doubt of their identity, since the polygonal whorls and deep cut 

 grooves give the species a peculiar and unmistakable fades. The 

 grooving is especially and constantly characteristic in this species, 

 and must frequently be chiefly relied upon for its identification, since 

 not only the carina but the folds may become obsolete or nearly 

 so, if I have rightly judged the materials at hand. 



Gray's figure is a good representation of the young of B. glaciale, 

 except in the smaller number of folds, the form being exactly the 

 Fame ; but in his description the grooving is spoken of in such a 

 way that he had undoubtedly before him the shell we have described 

 above. In B. glaciale the secondary grooves are never conspicuous, 

 and can scarcely be detected by the unassisted eye. Gray's speci- 

 men was from Icy Cape. 



Middendorff reports this species as found on the coasts of Nova 

 Zembla and Lapland. But I am by no means certain that his 



