Shell of six whorls, which are rather shouldered but not at all cari-nated. Aperture one-half the length the shell or a little less. Outer lip strongly arched, forming a right angle with the body whorl, somewhat effuse anteriorly. Columella with a thick white callus, with a groove behind it, somewhat arched and twisted. Siphonal fasciole well-marked, rather narrow, canal short, recurved, rather elongated. Color of shell white, with a purple tint within. Sculpture consisting of faint, primary, revolving ridges, obsolete on the convexity, and more evident on the anterior part of the last whorl; absent on the upper whorls. Secondary sculpture of fine crenulated thread-like lines, about eighty to the inch, which are decussated by the lines of growth. The whorls are crossed by stout, waved, rounded ribs (twelve on the last whorl), which are evanescent on the anterior portion of the last whorl, roundly shouldered on the last whorl, less so on the upper ones; their anterior declivity rather sharper than their posterior slope. These ribs are a little wider than the interspaces. Epidermis yellowish-brown, thin, smooth, following the sculpture of the surface. Lat, 2.5; long., 4.5; long, of aperture, 2.4; lat. of aperture, .14 in. (Dall.)
TYPE in United States National Museum. Type locality, Captain's Harbor, Unalaska.
RANGE. Aleutian Islands to Cook's Inlet, Alaska.

Shell of six whorls, which are rather shouldered but not at all carinated. Aperture one-half the length of the shell or a little less. Outer lip strongly arched, forming a right angle with the body whorl, somewhat effuse anteriorly. Columella with a thick white callus, with a groove behind it, somewhat arched and twisted. Siphonal fasciole well marked, rather narrow. Canal narrow, recurved, rather elongated. Color of the shell white, with a purple tint within. Sculpture consisting of faint, primary, revolving ridges, obsolete on the convexity, and more evident on the anterior part of the last whorl; absent on the upper whorls. Secondary sculpture of fine crenulated threadlike lines, about eighty to the inch, which are decussated by the lines of growth. The whorls are crossed by stout, waved, rounded ribs (twelve on the last whorl), which are evanescent on the anterior portion of the last whorl, roundly shouldered on the last whorl, less so on the upper ones ; their anterior declivity rather sharper than their posterior slope. These ribs are a little wider than the interspaces. E ndermis yellowish brown, thin, smooth, following the sculpture of the surface.
Lat. 2,5, lon. 4,5 in. ; lon. apert 2,4, lat. of do. 1,4 in.; defl. 55°. The suture is very deep, not channelled, and the upper part of the ribs of one whorl fit into the interspaces of the whorl above.
Habitat, Captain's Harbor, Unalashka. One specimen. I am under the impression that a fine specimen of this shell is in the cabinet of Dr. Newcomb, now belonging to Cornell Uni¬versity, and came from the Aleutian Islands.
This magnificent species, after a careful examination by Dr. Stimpson, was pronounced to be new, and further study has confirmed me in the opinion. There is no species of Buccinum known to me which closely resembles it. The shell most like it is the Chrysodomus Beringi, of Middendorf, which, apart from its generic characters, is immediately distinguishable by its smooth surface, irregular ribbing, straight canal and columella, and subtriangular aperture. The present species is one of the largest and finest species of the entire genus.

Kadiak group of islands