wall] new species of shells 165 



Station 4779, in 54 fathoms, Petrel Bank, Bering Sea, June 9, 

 1906. U. S. Nat. Mus., 110,484. 



The dextral form of this species has not hitherto been known, 

 though a dextral specimen of the V. (P.) deformis Gray, has been 

 for some years in the national collection from the eastern part of 

 Bering Sea. These dextral specimens are, however, of very great 

 rarity. 



Genus LIOMESUS Stimpson 

 LIOMESUS BISTRIATUS Dall, n. sp. 



Shell small for the genus, very thick and solid, flesh-color and 

 yellowish-white, with two smooth polished nuclear and three sub- 

 sequent moderately inflated whorls, subtabulate at the shoulder; 

 spire short-conic ; sculpture of two or three sharply impressed spiral 

 lines at the shoulder and on the base, with numerous almost micro- 

 scopically fine spiral striae, with a tendency to form fascicles of four 

 or five each ; shell in front of the suture flattish, but the tabulation 

 not bounded by a keel ; aperture short, wide ; outer lip thick, white, 

 simple, slightly expanded ; body with a thin wash of callus ; pillar 

 short and thick, white, callous, shorter than the aperture, twisted, 

 not pervious ; canal very short, wide, recurved, with flaring edges. 

 Lon. of shell, 18; last whorl, 14; of aperture, 11 ; max. lat. of shell, 

 12 mm. 



Station 4809, in 207 fathoms, off Hakodate, Japan, July 16, 1906. 

 U. S. Nat. Mus., 110,500. 



A very neat, compact, and unique little species, in which it is likely 

 the major incised lines may in some individuals extend over the 

 larger part of the last whorl. Both specimens obtained were dead. 



Genus TROPHON Montfort 



Subgenus BOREOTROPHON Sars 



BOREOTROPHON ELEGANTULUS Dall, n. sp. 



Shell thin, pellucid white, with a nebulous brown band in front of 

 the suture, one on the last whorl in front of the periphery and a third 

 on the canal ; elongate, acute, slender, the whorls of the spire rotund, 

 looking like the spire of a Scala; suture distinct, with two nuclear 

 (eroded) and five subsequent whorls; varices 10 to 12, very thin, 

 sharp, reflected, patulous near the suture, but not coronate or 

 spinose ; early whorls with three or four distant obscure, spiral 

 threads which later become obsolete ; the surface also finely 

 closely spirally striate ; aperture elongate-oval, outer lip thin, 

 3 



