210 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
Type in United States National Museum, No. 205923. Type locality, 
United States Fish Commission Station 4777, on Petrel Bank, Bering Sea. 
Range. Petrel Bank, Bering Sea, to Aleutian and Shumagin Islands. 
SECTION MICROFUSUS Dali, 1916 
Plicifusus brunneus Dali, 1877 
Plate 28, fig. 1 
Proceedings of the California Academy of Sciences, 7 :6. Scientific Results of the 
Exploration of Alaska; PI. 2, fig. 4, 1879. 
Shell small, yellow-brown, sculptured with revolving rounded ridges, 
separated by incised lines, and by transverse, rather narrow, slightly 
waved costae, which become obsolete on the periphery of the last whorl. 
Canal short; aperture lunate or elongate oval; outer lip -crenate, rather 
thin; inner lip smooth. Whorls six, rounded; suture conspicuous with the 
rounded posterior ends of the costae, rendering it wavy; ridges, eight on 
the fifth whorl, twice as numerous on the last whorl. Costae, about four¬ 
teen on the last whorl. Length, .7 in.; width, .32; canal and aperture, 
.35 in; spire, .35 in. (Dali.) 
Type in United States National Museum. Type locality, Nunivak 
Island, Bering Sea, in 10 fathoms. 
Range. Port Clarence, Bering Strait, to Nunivak and the Pribilof 
Islands. 
Described as a Chrysodomus. 
SECTION LATIFUSUS Dali, 1916 
Plicifusus griseus Dali, 1877 
Proceedings of the United States National Museum, 12:322; PI. 5, fig. 6. 
Shell thin, solid, rather acutely pointed when perfect, but almost in¬ 
variably eroded at the tip, eight-whorled, covered with an olive-gray 
epidermis, the substratum, pillar throat, and reflected lip milk-white; 
nucleus eroded, small; suture distinct, not appressed or channeled; whorls 
full and rounded; transverse sculpture of twenty to twenty-five, narrow, 
somewhat irregular, arcuated, wave-like ribs, which on the earlier whorls 
often reach from suture to suture but are strongest on the periphery; some 
specimens have them faint, others, the majority have them strong, but in 
all they become more or less obsolete on the last whorl; spiral sculpture 
of rather coarse, rounded, not much elevated cinguli, with narrow inter¬ 
spaces, slightly reticulated by the incremental lines; variable in strength 
