1894. PROCEEDINGS OF THE NATIONAL MUSEUM. 707 



BUCCINUM OVULUM, new species. 

 Plate XXX, lig. 6. 



Station 3491, near Amuklita Pass, Aleutians, in 248 fathoms, sand. 

 No. 100997, U.S.N.M. 



Shell small, thin, of about four and a half or five whorls; surface 

 smooth, or with faint irregular spiral threads mostly obsolete; covered 

 with a vernicose adherent olive-green epidermis; substance of the shell 

 livid pinkish purple, with a white margin to the pillar and aperture; 

 last whorl much the largest; suture deep but not channeled; nucleus 

 eroded in all the specimens; pillar nearly straight, thin, with a deep, 

 very short, hardly recurved canal; body sometimes with a thin wash of 

 yellowish callus; operculum small, nearly circular, the nucleus subcen- 

 tral, surface of attachment fanshaped, reflected by a depression in the 

 concave outer surface. Length of shell, 25; maximum diameter, 20 mm. 



This interesting and elegant species recalls Volutharpa, but seems 

 more nearly related to the preceding species. 



Subgenus Sulcosinus, Dall. 



Shell thin, with a deeply channeled suture, strongly reflected lip, and 

 thick parietal callous deposit. Type Buccinum taphrmm, Dall. 



BUCCINUM (SULCOSINUS) TAPHRIUM, Dall, 

 Plate XXIX, lig. 6, 

 Buccinum taphrium, Dall, Proc. U. S. Nat. Mus., xiv, 1891, p. 186. 

 Station 3330, in Bering Sea north of Unalaska, in 351 fathoms, 

 muddy bottom; temperature 37.8° F. No. 122548, U.S.N.M. 



In the absence of the operculum and soft parts this remarkable shell 

 can be only provisionally classified. It appears buccinoid, but differs 

 from all true Buccinum by its channeled suture and prominent body 

 callus. It may prove to be a wholly distinct genus, but for the present 

 it seems best to refer it to Buccinum as a subgenus. Only a single 

 specimen is known. 



Genus C HR YSOD OM US, Swaiuson. 



CHBYSODOMUS INSULARIS, new species. 



Plate XXIX, fig. 3. 



Station 3489, in Bering Sea near the Pribilof Islands, in 184 fathoms, 

 muddy bottom; temperature 38.5° F. No. 107000, U.S.N.M. 



Shell large, solid, rather thin, with about six whorls exclusive 

 of the (decollate) nucleus; whorls full, rounded, slightly excavated in 

 front of the appressed suture; sculpture of, on the last whorl, three 

 sizes of flattish rounded threads, alternating regularly in size, but 

 on the upper whorls of only two alternated sizes separated only by 

 shallow grooves; transverse sculpture of moderately prominent incre- 

 mental lines; aperture ample, the pillar lip blotched with livid pink 



