BUCOINUM. 191 



lip smooth, entire, slightly thickened, white on the edge, orange- 

 yellow within, extending a little in advance of the columella ; 

 apex rather acute, suture appressed ; whorls seven, regularly 

 tapering, not inflated ; lip not waved posteriorly, and meeting 

 the whorl at a rather sharp angle. 



Length 2'18 in., width 1 in. ; length of aperture, 1-05 in. 



Aleutian Islands. 



A very doubtful, unfigured species. The original description 

 is given above. Probably == B. cyaneurri, var. 



B. CILTATUM, Fabricius. PL 79, figs. 381, 3S. 



Shell small, ovate, strongly ribbed and with fine revolving 

 stria? ; solid, becoming very thick with age ; aperture elliptical, 

 elongated and narrow, a little more than half the. length of the 

 shell ; outer lip scarcely at all sinuated ; columella with a dis- 

 tinct tooth or projection near its lower extremity, corresponding 

 to the second fold of the columella seen in several other species, 

 such as B. tenue and B. undatum, but more tooth-like and con- 

 stituting an important and easily recognized specific character ; 

 periostraca ciliated. Length, 1*54 in. 



Greenland, Nova Scotia, Newfoundland, 



Behrincj Straits, and the Arctic Sea north of it. 



" Although B. ciliatum is the most distinct and well-marked 

 form in the genus, it is by no means a common species, and has 

 been frequently referred to other quite different species, for want 

 of attention to its peculiar characters." So says Dr. Stimpson, 

 but I must confess rny inability to separate it satisfactorily from 

 B. cyaneum. If I rightly understand the specimens before me, 

 I think that it will prove to be a dwarf, slow-growing race of the 

 last-nani(''d species. B. ciliatum of Gould and American authors 

 generally, is a very different shell and is equivalent to B. Hum- 

 l>hr<'iixici.innii, Bennett. It is the B. Molleri of Reeve's Index, 

 and B. tenebrosum of Middendorff (fig. 382). 



B: FRINGILLUM, Dall. 



Shell white, resembling B. sericatum, Hancock (= cyaneum), 

 on the one hand, and B. ciliatum, Fabr., on the other. It has the 

 dense fringed epidermis of ciliatum (when the shell is perfect), 

 with the sculpture of the same, but wanting the tooth on the 

 columella, and having a number of sharp carinaB not found in 



