CLASS GASTROPODA 
247 
Type in United States National Museum, No. 223098. Type locality, 
United States Fish Commission Station 3305, southwest of Hagmeister 
Island, Bering Sea. 
Range. Pribilof Island, Bering Sea, to Queen Charlotte Islands. 
Buccinum diplodetum Dali, 1907 
Plate 17, fig. 6 
Miscellaneous Collections, Smithsonian Institution, 50:143. Bulletin 112, United 
States National Museum; PI. 10, fig. 3. 
Shell small, thin, whitish, with a thin olivaceous more or less fibrous 
periostracum and about six rapidly increasing whorls; spiral sculpture of a 
narrow, flat-topped, strong keel at the shoulder, frequently another at or a 
little beyond the periphery, and sometimes two smaller threads, between 
the suture and the shoulder; secondary sculpture of rather obscure flattish 
spiral threads with equal or narrower interspaces (but no sharp striation) 
covering the whole surface; suture distinct, not channeled or appressed; 
aperture semilunar, outer lip thin, slightly reflected; throat, body, and 
pillar glossy white; pillar short, straight; canal very short and wide, re¬ 
curved, with an obscure fasciole; operculum well-developed, pale, with 
the nucleus near the middle of the outer edge. Long, of shell, 38; of last 
whorl, 26; of aperture, 17; max. diam., 21 mm. (Dali.) 
Type in United States National Museum, No. 110517. Type locality, 
Station 3074, off Sea Lion Rock, coast of Washington. 
Range. Off Sitka, Alaska, in 1569 fathoms, to Sea Lion Rock, Wash¬ 
ington, 877 fathoms. 
Buccinum cnismatum Dali, 1907 
Plate 17, fig. 1 
Miscellaneous Collections, Smithsonian Institution, 50:143. Bulletin 112, United 
States National Museum; PI. 10. fig. 2. 
Shell small, thin, with about six whorls, rapidly increasing, whitish 
with a very thin adherent brown periostracum; suture narrow, deep almost 
channeled; spiral sculpture of three, progressively diminishing, strong, 
wide, ill-defined ridges, the first forming a shoulder near the periphery, 
the interspace between it and the next anterior roundly excavated, the 
second with the suture under it, the third and smallest in the middle of 
the base; between the suture and the shoulder the slope of the whorl is 
flattish; the whole surface sharply microscopically spirally striated, with 
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