324 PROCEEDINGS OF THE NATIONAL MUSEUM. tol. 56. 



spirally closely threaded, but the rest of the shell without sculpture 

 except rude incremental lines; aperture rounded, outer lip heavy, 

 body and very short pillar with a thick coat of enamel; canal short, 

 very narrow and deep, recurved, with wide umbilical cavity between 

 a very prominent fasciole and the enamel of the pillar. Height of 

 shell, 62; of last whorl, 50; diameter, 44 mm. U. S. Nat. Mus. Cat. 

 No. 31350. 



Tifpe-locality. — Bering Sea, near Nunivak Island. 



All the specimens seen of this singular variety are much worn and 

 mostly somewhat imperfect, so that the complete lengths would 

 probably be greater than those given. 



CHRYSODOMUS HYPOLISPUS, new species. 



Shell small, yellowish under an olivaceous periostracum, with 

 about five whorls, including a swollen subglobular nucleus wider 

 than the succeeding whorl; suture distinct, not appressed; whorls 

 rapidly enlarging; axial sculpture only of faint incremental lines; 

 spiral sculpture of, on the spire, faint irregular low threads, finer in a 

 band near the preceding suture; on the last whorl these become more 

 evident, though not strong, and extend to the canal; the interspaces 

 are shallow narrow grooves; aperture rather wide, the outer lip thin, 

 sharp; the body erased, the pillar short, twisted; the canal short, 

 wide, recurved. Height of shell, 43 ; of last whorl, 32 ; of aperture, 24 ; 

 diameter, 22 mm. U. S. Nat. Mus. Cat. No. 205246. 



Type-locality. — U. S. Bureau of Fisheries station 4991, in the Japan 

 Sea, in 325 fathoms, mud. 



The operculum is normal. It is probable that the specimen is not 

 full grown. 



BUCCINUM TENUE Gray, 1849. 



From the original type of Gray, as determined by Stimpson, various 

 derivatives may apparently be traced, most of which have secured 

 specific rank, while other still exhibit connecting Imks. Among the 

 latter is a large rude form with much emphasized more or less broken 

 irregular ribs (Cat. No. 224069) and a conspicuous reddish brown 

 periostracum, with more than seven wliorls, a deep suture, and 

 cream-colored enamel. The type-specimen measures 89 mm. in 

 length with a diameter of 40 mm. For this form the varietal name of 

 rh.odiinii is now proposed. Another form from the eastern coast of 

 Kamchatka in 100 fathoms (Cat. No. 225611) has a strongly con- 

 stricted suture and about six rotund whorls, with the axial sculpture 

 largely obsolete and the periostracum a verj' dark olive ; this is 52 mm, 

 long and 32 mm. in diameter. In its other characters it agrees with 

 the normal type of the species. I propose for this variety the name 

 of ly per urn. 



