214 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
distinct, not appressed; base rounded with a narrow deep perforate um¬ 
bilicus; aperture subcircular, simple, the pillar lip hardly thickened, the 
body with a thin coat of enamel; height/ 3.5; diameter, 4.5 mm. (Dali.) 
Type in United States National Museum, No. 274122. Type locality, 
Arctic Ocean north of Bering Strait. 
Range. Arctic Ocean north of Bering Strait. 
Margarites (vahlii var?) tenuisculptus Carpenter, 1865 
Proceedings, Philadelphia Academy of Natural Sciences, 61. 
M. t. M. Vahlii forma, colore, et operculo simillima; sed striulis spirali- 
bus, plus minusve obsoletis cincta, quarum iv.-vi. in spira monstrantur. 
Long., .22; long, spir., .11; lat., .13; div. 70°. (Carpenter.) 
Shell like M. vahlii in form and color and operculum; but girdle with 
spiral small striae more or less obsolete, of which four to six show on the 
spire. (T ranslation.) 
Type in ? Type locality, Neah Bay, Washington. 
Range. Neah Bay and Puget Sound. (Plover Bay, Krause?) 
Margarites umbilicalis Broderip and Sowerby, 1829 
Malacological and Conchological Magazine, 1:26. Conchological Illustrations, “Mar¬ 
garita,” fig. 5. Zoological Journal , 4:371. 
M. testa obtuse conica, obliqua, anfractibus sensim majoribus, longi- 
tudinaliter striatis; umbilico maximo. Long., 6/10; lat., 8/10; poll. 
(Broderip and Sowerby.) 
Only one specimen of this interesting species has occurred. The outer 
lip is much broken. (Broderip and Sowerby.) 
Type in British Museum. Type locality, Oceano Boreali. 
Range. Arctic coast. Circumboreal. 
Margarites olivaceus Brown, 1827 
Illustrations of the Conchology of Great Britain and Ireland; PI. 46, figs. 30, 31. 
Shell thin, olive-colored, pellucid, smooth, subglobose; body large, in¬ 
flated ; spire small, short, with three depressed volutions, terminating in a 
moderately pointed apex; aperture large, circular, standing out from the 
body; outer lip thin, continuous with the inner lip above, which is narrow, 
and a small circular umbilicus behind. Length, two-tenths of an inch. 
(Brown.) 
Type in ? Type locality, Greenock. 
Range. St. Lawrence Island; Atka Island, Aleutians. Also Atlantic. 
Described as Trochus olivaceus. 
[816] 
