BUCCINUM. 187 



surface is spirally rather distantly striated, which is plainly 

 visible to the naked eye, and also very minutely granosely striated, 

 only apparent with the aid of a lens. I do not know the species, 

 but it appears to be related to B. glaciale, Linn., some specimens 

 of which certainly exhibit, though in a less marked degree, per- 

 haps, the principal characteristics noted above. 



B. DONOVANI, Gray. PL 76, fig. 330 ; PI. 78, fig. 374. 



More elongated, with much more convex whorls than B. gla- 

 ciale. Sometimes slighty carinated on the middle of the body- 

 whorl. Ribs most prominent at the sutures, which they undulate, 

 soon becoming evanescent upon the body. 



Length, 2-25 to 3 inches. 



Banks of Newfoundland ; Greenland. 



The B. Donovani of Reeve is another species = B. Terrae- 

 Navae, Beck. B. tubulosum, Reeve (fig. 374), is, however, a syno- 

 nym. Dr. J. Gwyn Jeffreys makes Donovani a variety of B. 

 glaciale. 



B. CASTANEUM, Dall. 



Shell large, clear cjiestnut-brown, with whorls seven in number, 

 inflated and smooth, except for microscopic, closely crowded, 

 revolving striae. Suture distinct, not channeled. Apex rather 

 acute, pointed. Columella straight, with a faint fascicle. Aper- 

 ture wide, rounded, more than semicircular. A slight glaze on 

 the columella. Outer lip heavily thickened, expanded and smooth, 

 not projecting before the column nor waved ; within livid whitish 

 or purple. 



Length 2'5in.,diarn. 1*1 in.; length of aperture 1 in., width *75 in. 

 Shumagin Islands ( Alaska), 20 fathoms. 



A very remarkably distinct form in a genus where distinctness 

 is the exception and not the rule. I know of no species at all 

 resembling it. There are rarely faint costse on the junior whorls. 



Yar. TRICARINATUM, Dall. 



This form, which I now consider to be probably an extreme 

 race of the foregoing, has a similar color and fine microscopic 

 sculpture, but grows larger and is furnished with one strong carina 

 on the junior whorls and three on the last whorl. When the lip 

 is not formed they are remarkably similar to young Chrysodomus 



