202 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
stronger. Aperture excessively oblique, with the anterior angle much 
produced; lips hardly thickened, and but slightly interrupted at the junc¬ 
tion with the body whorl. Nacre, salmon-color; external surface pinkish- 
white, brilliantly pearly where eroded. Lat. of largest specimen, 0.85 in.; 
alt., 0.5 in.; defl., 88°. (Dali.) 
Type in ? Type locality, Iliuliuk Harbor, Captain’s Bay, Unalaska, 
Alaska. 
Range. Bering Strait and Sea, south and east to Unalaska, Alaska. 
Margarites vorticifera sharpii Pilsbry, 1898 
Proceedings, Philadelphia Academy of Natural Sciences, 486. 
Shell thin, of low-conoid form, with extremely broad funnel-shaped 
umbilicus and very rapidly expanding whorls. Color, dull salmon or brick- 
pink, becoming ashy on the spire and within the umbilicus. Sculpture, 
numerous spiral cords and threads, which on the spire are strong, alter¬ 
nately smaller, then with a tertiary series intercalated, the whole becoming 
less pronounced on the last whorl, where by further intercalation of 
threads the spirals become very numerous in some individuals, and in 
others mostly obsolete; the base with close, strong spiral cords outside the 
edge of the umbilicus; the whole surface with fine, crowded, and somewhat 
lamellar growth-striae, the spire with some spaced coarser radial riblets. 
Whorls 4j/2, very rapidly expanding, the last at the aperture about three 
times the width of the preceding (seen from above); gently convex; 
periphery angular; base convex, the umbilical region broadly excavated 
nearly as large as the aperture. Aperture large, very oblique, salmon 
colored within, with brilliant green reflections, but having a wide border 
within the lip appearing dull whitish from in front, but showing red and 
white reflections seen from below. Peristome thin, deeply excised in the 
umbilical region, above the excision produced forward as a low wall curved 
around the umbilical edge, continuing as far as the posterior termination 
of the outer lip. Alt., 7.5; greater diam., 14; lesser, 11 mm. (Pilsbry.) 
Type in Academy of Natural Sciences, Philadelphia, No. 70554. Type 
locality, Dutch Harbor, Unalaska. 
Range. Unalaska to Port Althorp, Alaska. 
Described as Margarita sharpii Pilsbry. 
Margarites vorticifera ecarinata Dali, 1919 
Scientific Results of the Canadian Arctic Expedition, 8:22A; PI. 2, fig. 5. 
Shell pinkish-gray, depressed, with about five rapidly enlarging whorls; 
nucleus minute, glassy; subsequent whorls moderately inflated, separated 
[804] 
