316 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.56. 



Type-locality. — U. S. Fish Commission station 3252, in Bering Sea, 

 between Bristol Bay and the Pribilof Islands, in about 30 fathoms, 

 mud; bottom temperature, 44.8° F. 



COLUS (AULACOFUSUS) ADONIS, new species. 



Shell small, bulimiform, thin, whitish Nvath a pale olive periostra- 

 cum, vnth about six whorls exclusive of the (lost) nucleus, with a 

 very narrowly channeled suture and moderately rounded whoils; 

 spiral sculpture of narrow e jual flat threads (about three to a milli- 

 meter) Avith very narrow interspaces over the whole shell, though the 

 interspaces are a little wider on the apical whorls and the spirals 

 under-nin there by thread-like axial sculpture, giving a somev/hat 

 punctate appearance under magnification; aperture elongate, rather 

 narrow, the outer lip thickened, not reflected, with traces of Ikation 

 near the inside margin; the bod}^ and pillar with a continuous layer 

 of enamel; canal short, wide, with no siphonal fascicle. Height of 

 shell, 37; of last whorl, 25; diameter, 15 mm. U. S. Nat. Mus. Cat. 

 No. 205212. 



Type-locality. — U. S. Bureau of Fisheries' station 5053, in Sui-uga 

 Gulf, Japan, in 503 fathoms, mud; bottom temperature, 34.9° F. 



The operculum is Chrysodomoid, but the liration is almost unique 

 in the group and derives from the external sculpture. 



COLUS (AULACOFUSUS) BRISTOLENSIS, new species. 



Shell small, white under an olivaceous periostracum, udth six 

 rounded whorls and a very minute (decorticated) nucleus; suture 

 distinct, not appressed ; spiral sculpture of (on the penultimate whorl 

 about 14) shallow grooves, becoming fainter on the last whorl, v^th 

 much wider flat mterspaces; axial sculpture of famt incremental 

 lines; aperture wide, semilunate, the outer lip sharp, thin, arcuate; 

 body wdth a thin coat of whitish enamel; pillar short, twisted, atten- 

 uated in front; canal short, v^dde, recurved; height of shell, 23.5; of 

 last whorl, 18; of aperture, 13; diameter, 11.5 mm. U. S. Nat. Mus. 

 Cat. No. 213254. 



Type-locality. — U. S. Fish Commission station 3252, in Bering Sea, 

 between Bristol Bay and the Pribiloff Islands, in 29^ fathoms, mud; 

 bottom temperature, 44.8° F. 



COLUS (AULACOFUSUS) BARBAEINUS, new species. 



Shell small, solid, pale gray, of about six whorls, the nucleus com- 

 pressed axially and rather acute, suture distinct, not appressed, whorls 

 conspicuously rounded; there is no axial sculpture except faint incre- 

 mental lines, the apical whorls are decorticated; spiral sculpture of 

 incised lines with slightly rounded vrider interspaces, about a dozen 

 on the penultimate whorl, quite uniform over the whole of the last 



