706 DEEP WATER MOLLUSKS AND BBACHIOPODS—DALL. vouxvu. 



The species nearest allied to this is probably P. gealei Aiigas, from 

 Australia, but it has more numerous ribs and differs otherwise. 



This concludes the series ot Hawaiian mollusks, the following species 

 being chiefly from the northwest coast, especially from the great plateau 

 of Bering Sea, which is remarkable for having, at comparatively mod- 

 erate depths, a fauna which seems entirely distinct from that of the 

 shores, and yet is not an abyssal fauna, properly speaking. Members 

 of this fauna, as will be observed in the notes on distributiou, often 

 reach a remarkable distance to the southward in water of the tempera- 

 ture normal to them, and, in fact, there are one or two species which 

 may prove to extend from Bering Sea to Cape Horn when sufficiently 

 full explorations are completed. 



NORTHWEST AMERICAN SPECIES. 



These were mostly described in the Proceedings of the United States 

 National Museum, xiv, pp. 186-190, July, 1891, and are now figured 

 with a few additional notes. Some errors in the details of habitat as 

 given in the original are here corrected, and a few new species are 

 added to the list. 



Genus BUCCINUM, Linn:eus. 



BUCCINUM STRIGILLATUM, D a 1 1 . 



Plato jcxvii, fig. 9. 



Bucdnum strigiUatiim, Dall, Proc. U. S. Nat. Mus., xiv, 1891, p. 186. 



Station 3076, off Tahwit Head, State of Washington, in 178 fathoms; 



temperature at bottom, 43.4° F. ; and south to station 3170, off Bodega 



Head, California, in 167 fathoms, muddy bottom. No. 122550, XJ.S.N.M. 



Other specimens were dredged off Guadelupe Island, Lower California. 



BUCCINUM ALEUTICUM, new species. 

 Plate XXVII, fig. 7. 



Station 3219, south of Unimak Island, Aleutians, in 59 fathoms, 

 sand; bottom temperature, 38° F. No. 122591, U.S.N.M. 



Shell thin, six whorled, covered by a thin sparsely pilose, dehiscent 

 epidermis; of a livid pinkish color with a white pillar and margin to 

 the outer lip and a dark chestnut nucleus; sculpture of extremely fine, 

 regular, close-set grooves, with equal or wider interspaces, regularly 

 spaced on the last, but tending to pair on the earlier whorls ; spire 

 short, rather pointed; whorls full; suture deep, but not channeled; 

 aperture moderate; pillar with a white callous ridge incurved upon it; 

 siphonal fasciole distinct, bounded by a groove behind; outer lip 

 slightly thickened, hardly reflected; throat livid brown; operculum 

 small, subcircular with a subcentral nucleus and fan-shaped scar of 

 attachment. Length of shell, 35; maximum diameter, 21 mm. 



The very tine, even striation recalls that of B. tenue Gray, but the 

 form is more like B. cyaneum. 



