CLASS GASTROPODA 
187 
4 ad 6 transversis exaratis; columella recta longiuscula; labio modice- 
calloso; labro simplici; apertura albescente, varicosa, ad plicas externas 
late-caniculata canali recto. Long., 116; lat., 60; anfr. ult., 69; lat. aper¬ 
ture, 35; col. ext. long., 51 mm. (Middendorff.) 
Shell yellowish, with external calcareous layer, solid, thick, ovate- 
fusiform, with whorls little convex, transversely plicate, with 9 to 11 
plications in each whorl; with 4 to 6 more obsolete interstitial; canals 
of the plications transversely inter-arched; with straight and longer colum¬ 
ella; with lip moderately callous; lip simple; aperture whitish, varicose, 
broadly canaliculate to the external plications; canal straight. (Trans¬ 
lation.) 
Type in Academy of St. Petersburg. Type locality, Bering Sea. 
Range. Arctic Ocean to Pribilof Islands. 
Volutopsius beringi kobelti Dali, 1902 
Plate 23, fig. 2 
Proceedings of the United States National Museum, 24:528; PL 35, fig. 2. 
Shell with the usual basal striation, but above the base the spirals 
when present are coarse, obsolete, sparse, and irregular. V. beringi is 
absolutely smooth, except at the canal. The axial waves (they can hardly 
be called ribs) of V. kobelti are feeble and irregular, the shell is relatively 
thin and light compared with V. beringi , and has much coarser incremental 
lines, more acute and rather higher spire, and a less effuse aperture. 
(Dali.) 
Type in United States National Museum, No. 108990. Type locality, 
Pribilof Islands, Bering Sea. 
Range. North end of Nunivak Island, Bering Sea, to Pribilof Islands. 
Volutopsius stefanssoni Dali, 1919 
Plate 16, fig. 9; Plate 19, fig. 2 
Scientific Results of the Canadian Arctic Expedition , 8:2 2a; PI. 1. 
Shell large, heavy, rude, pinkish-brown with a rosy protoconch and 
five rapidly enlarging whorls; nucleus swollen, large, irregular, of about 
two whorls blunt at the apex; suture distinct, not channeled; whorls in¬ 
flated, with a high rounded shoulder and five or six obscure swellings at 
the shoulder which do not become definite ribs; there is no spiral sculp¬ 
ture, but the lines of growth are rude and occasionally lamellose, especially 
toward the aperture in senile individuals; canal short wide, slightly re- 
1187 ] 
