1886.] PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 305 



0. stejnegeri, and from this point the shell is sube^'lindrical, strongly 

 decussately sculptured, with the same number of rev^olving and trans- 

 verse threads as in C. stejnegeri ; but the sculpture is less flattened and 

 at the intersections forms a node ; the base is faintly or not at all sculp- 

 tured ; the specimens, none of which seemed quite mature, had about 

 four whorls after the truncation ; the color, a pinkish, very light brown, 

 differs from that of C. stejnegeri, which is de«^) wine color, and has a 

 glassy gloss, while C. truncatum is dull-surfaced. I have had a doubt 

 as to whether the peculiarity might not be pathological, but the num- 

 ber of similar specimens observed seems too great. Lon. of shell, 3.3; 

 lat., 2.0'""'. Habitat, Unalashka and Chica Islands, in sponges at low- 

 water mark, 1874. 



The C. stejnegeri has been collected from the Shumagins to Bering 

 Island. The only other species of the group yet found in Alaska, so 

 far as I know, are dead specimens of a large form resembling G. emer- 

 sonii or tuberculata, which have been found very rarely at Sitka, and 

 once at Unalashka, from low-water mark to 12 fathoms. 



Velutina conica, n. s. (PI. Ill, fig. 10). 



Shell solid, strong, white, with an imperceptible or extremely thin 

 epidermis ; finely striate in each direction, four-whorled, the last much 

 the largest ; suture narrow, but channeled ; aperture oblique ; axis 

 within the columella not pervious to the eye; columella narrow, strong, 

 with a light wash of callus, and no umbilical chink ; alt. of shell, 10.0; 

 of aperture (parallel to the axis), 7.5 ; max. lat. of shell, 7.6'""'. 



Found at Unalashka, Kadiak, and other places in the Aleutian re- 

 gion ; not uncommon at depths of 5-15 fathoms. Specimen figured, 

 from Unalashka. 



This species differs from its relatives in the same region by its want 

 of a perceptible epidermis, its solidity, its conical shape, in wholly con- 

 taining the soft parts without any exceptional contraction by the ani- 

 mal, and in its narrow columella. There is no closely analogous Euro- 

 pean species, nor is this one yet reported from the Oregonian region. 

 The fine wavy longitudinal striae are not perceptible without a glass ; 

 to the eye, except for lines of growth, it appears smooth. 



Family EISSOID^. 



This group is very sparsely represented in these seas — a fact which 

 may be contrasted with the abundance of individuals and even of spe- 

 cies on either side of the North Atlantic in the same latitude. The 

 only form which was found anywhere abundantly was the Cingula ro- 

 husta, and even in that case the abundance was but relative. A resum^ 

 of the i)rincipal forms collected, with figures, may be of use. Several of 

 them appear closely related or identical with forms of north European 

 waters. 



Proc. N. M. 86 20 October 19, 1 8 86. 



