186 BUCCINTJM. 



than in the North Atlantic, and the vicinity of Behring's Straits 

 may be considered the metropolis of the species. It has been 

 erroneously reported as from the Orkney Islands, but is not 

 British. Mr. W. H. Ball, to whose enlightened explorations in 

 Alaska conchology is so greatly indebted, was the first to point 

 out the protean characters of this species and to assign to it a 

 numerous synonymy. I have figured the typical glaciale (fig. 

 345) and a two-carinated form (fig. 367), B. angulo&um, Gray, 

 evidently not adult (fig. 368), and regarded by Stimpson as a 

 distinct species, B. carinatum (fig. 3*72), B. rutilUm (fig. 369), 

 B. Bomber gi(&g. 37 0), and J5. Morchianum (fig. 371), of Dunker's 

 Novitates. Besides these, B. Stimpsoni and B. Roger si of Gould, 

 two unfigured species from the vicinity of Behring's Straits, are 

 referred to this species by Mr. Ball. 



Var. POL ARE, Gray. 



This form has been described but not figured ; nevertheless, 

 Stimpson recognizes it as a distinct species differing from B. 

 glaciale in its thin structure, shouldered whorls and narrower aper- 

 ture. B. Groenlandicum of Hancock (fig. 373), which I consider 

 equivalent to polare, is also treated as distinct by Stimpson, who 

 says that it is narrower and smaller, without shouldered whorls. 

 This latter difference depends upon whether one or two carina 

 are developed on the body-whorl. I think the only reason for 

 considering polare (including Groenlandicum) as a variety is 

 the thinness of the shell, 



B. MIRANDIJM, E. A. Smith. 



Shell ovate, thick, pallid, brownish red, irregularly maculated 

 upon the spiral ribs, invested with a fugacious, thin, light olive 

 epidermis ; whorls seven, concave and angulated above, concave 

 below the angle, longitudinally plicate, encircled by two nodose 

 ribs, and shallow sulcations, minutely granosely striate, beneath 

 the suture somew r hat rugose ; aperture light brown, scarcely more 

 than half the total length, labrum sinuated by the spiral carinae, 

 canal short, slightly recurved. Length 53, diam. 25 mill. 



East Yesso, Japan; 11 fathoms. 



The plications which produce nodules on the spiral elevations 

 become almost obsolete on the last half of the body-whorl. The 

 nodules number about ten on the penultimate whorl. The entire 



