CLASS GASTROPODA 
201 
Range. Nunivak Island, Bering Sea, to San Pedro, California; San 
Diego, in deep water. 
Described as Trochus pupillus Gould. 
Margarites cinerea Couthouy, 1838 
Journal, Boston Society of Natural History, 2:99; PI. 3, fig. 9. 
T. testa pyramidali, tenui, cinerea; anfractibus convexiusculis, costellis 
numerosis cinctis, longitudinaliter tenuissime striatis; basi subconvexa, 
perforata; labro tenui, crenulato; intus margaritacea; operculo corneo. 
Diameter of axis, nine-twentieths; of basis, eight-twentieths of an inch. 
Shell conical or pyramidal, thin, uniform ash color, whorls slightly convex, 
varying from five to seven; sutures distinctly marked; the lower whorl 
has four and sometimes five or six revolving, elevated striae or small ribs, 
which diminish in number as they approach the apex; the most central of 
these is the largest, and gives rather a carinated aspect to the middle 
portion of the whorls. The shell is longitudinally traversed by closely 
set, delicate, sub-laminar, oblique striae, not interrupted by the costae, and 
giving two or three of the apical whorls something of a nodulous or 
gemmulated appearance. Base slightly convex, with transverse and con¬ 
centric striae, like the whorls, and perforated about half the length of the 
shell. Aperture circular, slightly angulated by the junction of the outer 
lip, which is crenulated by the termination of the striae and slightly 
reflected in its columellar portion, so as to conceal a small part of the 
umbilicus, in adult specimens. Interior pearly; operculum horny, trans¬ 
parent and multispiral. (Couthouy.) 
Type in Couthouy Collection. Type locality, Massachusetts Bay. 
Range. Bering Strait to Port Etches, Alaska. Circumboreal. 
Described as Turbo cmereus Couthouy. 
Margarites vorticifera Dali, 1873 
Plate 100, figs. 7, 8 
Proceedings of the California Academy of Sciences, 5:59; PI. 2, fig. 4. 
Shell depressed, with three flattened, rapidly expanding whorls, which 
have a tendency, in old individuals, to overhang the suture anterior to 
them. The upper surface is traversed by numerous slender, slightly ele¬ 
vated, revolving threads, which are crossed by faint lines of growth. 
Outer edge of whorls subcarinate. The basal surface is less flattened, but 
similarly sculptured, except that the very wide and funnel-shaped umbilicus 
is destitute of revolving striae, and the lines of growth are here a little 
[803 1 
