1865.] REVIEW OF THE NORTHERN BUCC1NUMS. 375 



has considerable resemblance to that of B. glaciate, the primary 

 grooves being deep cut, with the intervening ridges depressed. 

 But the grooving is far less regular than in that species; the 

 primary grooves are more crowded near the suture, and the ridges 

 less flattened. The secondary grooves, on the surface of the pri- 

 mary ridges, are usually as fine as in B. glaciale, but often one or 

 more of them becomes deeper, making the sculpture resemble more 

 that of angulosum. Aperture oval, less than one half the length of 

 the shell, and narrower than in B. tenue. The columella does not 

 project beyond the level of the anterior part of the outer lip, but 

 rather falls short. The columella shews the usual three folds, but 

 the middle fold being nearly longitudinal and parallel to the 

 lowermost fold, the latter cannot be seen in a front view, but it is 

 easily seen in an edge view of the columella, (in broken specimens 

 of the shell,) separated from the marginal middle fold by a longitu- 

 dinal sulcus. The first and second (uppermost and middle) folds 

 are separated by a broad deep sinus. Periostraca thin, smooth, not 

 ciliated. 



Length, 2.23 ; breadth, 1.2 inch. Another specimen is 2.5 inches 

 long, proportionally more slender. 



It may be described in brief language by saying that it has 

 nearly the form and plaits of B. tenue with a striation of the 

 glaciale type. It evidently approaches nearest to tenue, but besides 

 the difference in the striation, the much greater regularity of the 

 longitudinal plaits will serve to distinguish it. 



Of this species there are two specimens in the museum of the 

 Smithsonian Institution, which were dredged alive in twenty to 

 thirty fathoms in the Arctic Ocean north of Behring's Straits, by 

 Capt. John Rodgers, U. S. N., while on the North Pacific Explor- 

 ing Expedition. 



I have, among a number of fossil Buccinums kindly loaned by 

 Dr. Packard, two imperfect specimens, probably of this species, from 

 the pleistocene beds of Portland, Me. They differ from the 

 Behring's Straits specimens only in the following particulars. The 

 shell is broader and thicker, with fewer (thirteen) longitudinal folds 

 none of which are interrupted ; — thus approaching B. undulatum 

 in these respects. The primary ridges are more convex, and are 

 alternately wider and narrower. The secondary grooves are rather 

 less numerous. 



These differences may prove to be specific, when perfect spe- 



