158 SMITHSONIAN MISCELLANEOUS COLLECTIONS [VOL. 50 



numerous in species in the northwestern Pacific, Bering, and Ok- 

 hotsk seas. 



CHRYSODOMUS (ANCISTROLEPIS) GRAMMATUS Dall, n. sp. 



Shell large but thin, with about nine subtabulate whorls, sculp- 

 tured with eight or nine very prominent T-rail-shaped spiral ribs, 

 separated by somewhat wider, deeply channeled interspaces ; about 

 five of these spirals show between the sutures on the spire ; surface 

 covered with a rather thick, axially striated brown periostracum, un- 

 derneath which is a thin chalky layer of shell easily eroded ; pillar 

 and canal, as in all the group, shorter than the aperture, the pillar 

 twisted and more or less pervious, but little recurved ; pillar and 

 body with a conspicuous white callus ; aperture wide, squarish, the 

 outer lip crenulate by the sculpture, protracted in front beyond the 

 end of the pillar ; throat white, not lirate, but reflecting the external 

 ribbing. Lon. of 2 shell, 101 ; of last whorl, 65; of aperture, 40; 

 max. lat. of shell, 53 ; of aperture, 30 mm. 



Station 5032, in 300 fathoms, Tsugaru Strait, September 30, 1906. 

 U. S. Nat. Mus., 110,472. 



This recalls C. (A.) eucosmius Dall from Bering Sea, but is much 

 larger, with more prominent sculpture and a less twisted pillar. The 

 operculum is heavy, large, and black, of the typical form, though 

 in the young it is lighter-colored and slightly arcuate. The sculpture 

 recalls that of Beringius crcbricostatus Dall. 



Genus TRITOXOFUSUS Beck 

 TRITONOFUSUS CALAM^US Dall, n. sp. 



Shell thin, white, covered with a straw-yellow periostracum and 

 having about six well-rounded whorls ; suture very distinct ; apex 

 eroded, nucleus apparently small; sculpture entirely spiral, of (be- 

 tween the sutures on the penultimate whorl, 12) flattish, low, equal, 

 slightly rounded, spiral ridges, separated by narrower, subequal, 

 channeled interspaces and crossed only by faint incremental lines ; 

 aperture milk-white, the body with an eroded polished area, the pillar 

 thick and white, twisted and recurved anteriorly ; canal wide, short, 

 with no siphonal fasciole ; outer lip thin, slightly reflected. Lon. of 

 shell (tip eroded), 57; of last whorl, 42; of aperture, 32; maximum 

 diameter of shell, 28; of aperture, 14 mm. 



Station 4797, in 682 fathoms, Okhotsk Sea, June 20, 1906. U. S. 

 Nat. Mus., 110,478. • 



Notable for its regular sculpture, cheerful yellow color, and 

 milky-white aperture. The operculum is large and brown in color. 



