186 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
wave-like, axially directed prominences or even with feeble axial ribs; 
the aperture ample, the canal short, wide, hardly differentiated. Oper¬ 
culum short-ovate or rounded-quadrate, the nucleus at the right anterior 
corner. (Dali.) 
Type. Fusus largillierti Petit. 
Distribution. Boreal and Arctic; especially numerous in the Bering 
Sea region. 
Volutopsius fragilis Dali, 1891 
Plate 10, fig. 4 
Proceedings of the United States National Museum, 14:187; 17; PI. 28, fig. 4, 1894. 
Shell thin, inflated, five-whorled, pinkish, with a thin dehiscent epi¬ 
dermis, fine wavy spiral striae, strongly recurved canal, and widely re¬ 
flected outer lip. Spire very short, whorls irregularly ribbed near the 
shoulder or sometimes having imbrications like a Trophon in place of 
ribs; axis nearly pervious. Length of aperture, 70; of shell, 100; breadth, 
63 mm. (Dali.) 
Type in United States National Museum. Type locality, Station 3252, 
off Unimak Island, Bering Sea, in 15-121 fathoms. 
Range. Known only from type locality. 
Volutopsius melonis Dali, 1891 
Plate 10, figs. 2, 3 
Proceedings of the United States National Museum, 14:187; 17; PI. 28, figs. 2,3,1894. 
Shell large, very thin, inflated, pinkish or yellow and white, last whorl 
much the largest, the aperture but little expanded, general form ovate, 
with numerous short obscure waves near the shoulder; surface faintly 
striated, with obscure spiral bands on some portions. Length, 137; 
breadth, 75 mm. (Dali.) 
Type in United States National Museum. Type locality, Station 3227, 
off the coast of Unalaska Island, Bering Sea. 
Range. Known only from type locality. 
Volutopsius beringi Middendorff, 1846 
Beitrage zu ciner Malacologia Rossica, 2:147; PI. 3, figs. 5* 6. 
Testa flaviccenta, strato externo calcareo, solida, crassa ovato- 
fusiformi anfractibus parum convexis, transversim plicatis, plicis in 
quoque anfractu 9 ad 11; plicarum interstitiis canaliculis obsoletioribus 
[ 186 ] 
