1907.] NATURAL SCIENCES OF PHILADELPHIA. 243 



NEW AND LITTLE-KNOWN WHELKS FROM NORTHERN JAPAN AND THE 



KURIL ISLANDS, 



BY H. A. PILSBRY. 



Volutopsius hirasei n. sp. (PI. XIX, fig. 2.) 



The shell is fusiform, thick and solid, glossy where unworn, livid 

 under a very thin, smooth transparent cuticle, which however is largely 

 worn from the type. "Whorls 6^, strongly convex, separated by deep 

 sutures. Surface sculptured with low spiral threads, rather close and 

 fine below the suture, widely spaced in the median part of the last whorl, 

 becoming close on the base, and coarser on the anterior narrow portion. 

 The aperture is livid brownish within, outer hp expanded, white, thin 

 at the edge. The columella is weakly sinuous, covered with a white 

 callus. There is also a small but rather thick callus near the posterior 

 angle of the aperture. A thin transparent callus spreads forward on 

 the parietal wall. 



Length 72, diam. 34 mm. ; length of aperture 42 mm. 



Kisennuma, Rikuzen. Tj^^e No. 93,443, A. N. S. P., from Xo. 1,312 

 of Mr. Hirase's collection. 



This species is related to V. regularis Dall, but differs by the longer 

 basal canal and the sculptured surface, V. regularis being smooth. 



Beringius polynematicus n. s:p. (PI. XIX, fig. 1.) 



Shell closely resembhng B. frielei Dall,^ large, thin, dirty white under 

 a strong brown cuticle, mainly worn from the type, a "dead" shell. 

 Sculpture of shallow spiral grooves, about 2 mm. apart 

 on the last whorl, not much more than half that on the 

 penultimate; the spaces between these grooves slightly 

 convex, and sculptured with five or six irregular spiral 

 threads on the last whorl (fig. 1), about four on the 

 penultimate. Six and one-half strongly convex whorls 

 remain, the apex being defective. The aperture is wide, the outer lip 

 smooth within, thin; basal canal quite short. Columella very weakly 

 sigmoid ; callus on the inner margin thin, not spreading forward. 



Length 140, diam. 59 mm. ; length of the aperture 64 mm. 



Kisennuma, Rikuzen. Type Xo. 93,444, A. X. S. P., from Xo. 1,760 

 of Mr. Hirase's collection. 



» Proc. U. S. Nat. Mus., 1894, p. 711, pi. 27, fig. 8, from Bering Sea. 



