164 SMITHSONIAN MISCELLANEOUS COLLECTIONS [VOL. 5c 



The specimen is about half grown, but the difference in the sculp- 

 ture is extreme. It came from the so-called Petrel Bank, in the 

 western part of Bering- Sea. 



VOLUTOPSIUS LIMATUS Dall, n. sp. 



Shell small, fusiform, periostracum milky gray in color over a 

 chalky substratum, with about six turreted whorls, more or less 

 eroded, but with a swollen nucleus and the operculum of Vohitopsius; 

 whorls plump, flattish in front of the suture, but with no angle or 

 keel at the shoulder; surface with a smooth band near the suture, 

 the remainder with fine spiral stri?e ; the interspaces flat except 

 on the canal, where they are somewhat rounded, and the sulci 

 widen to channels somewhat narrower than the intervening ridges ; 

 aperture elongate, livid purple within, a purple callus on the body, 

 the pillar white ; outer lip slightly expanded, simple, sharp ; canal 

 wide, recurved, axis not pervious. Lon. of shell, 62; of last whorl, 

 46; of aperture, 38; max. lat. of shell, 27; of aperture, 13.5 mm. 



Station 5038, in 175 fathoms, and 5040, in 269 fathoms, off the 

 south coast of Yesso. U. S. Nat. Mus., 110,493 an d 110,492 re- 

 spectively. 



VOLUTOPSIUS SIMPLEX Dall, n. sp. 



Shell large, thin, pale brown, Avith five or six whorls somewhat 

 constricted at the suture ; nucleus large, mammillate, of about two 

 whorls ; subsequent whorls rather convex, smooth, or marked only 

 by irregularities of growth or incremental lines ; profile fusiform, 

 the last whorl largest but not expanded ; outer lip arcuate, sharp, 

 slightly thickened but not reflected ; body without callus ; pillar con- 

 cave, curved to the right, twisted, short, with hardly a trace of a 

 siphonal fasciole; canal short, wide, not recurved. Lon. of shell, 101 ; 

 of last whorl, 80; of aperture, $J ; maximum diameter of shell, 45; 

 of aperture, 26 mm. 



Station 4792, in J2 fathoms, off Bering Island, June 14, 1906. 

 U. S. Nat. Mus., 110,475. 



This is larger, thinner, smoother, and with a higher spire than 

 any of the varieties of V. castaneus Morch, which has a more irregu- 

 lar surface. V. regularis Dall is much smaller, relatively heavier,, 

 more regular, and of a different color. 



VOLUTOPSIUS (PYROLOFUSUS) HARPA, var. DEXIUS Dall 



Shell resembling the ordinary type, but with stronger and closer 

 spirals and dextrally wound. Lon. of shell, 130 mm., the outer lip- 

 defective. 9 . 



