CLASS GASTROPODA 
45 
nodosa, albo-grisea vel fulva; apertura ovato-anguata, utrinque attenuata; 
labro acuto, in medio inflexo et emarginato. (Deshayes.) 
Shell thick, solid, rotund, with a short spire of about three whorls with¬ 
out the nucleus, the body rude, with coarse nodulous or subspinose major 
spirals, a more or less flaring, thickened, outer lip, a very arcuate flattened 
pillar, short and hardly recurved canal, and sealed umbilical convexity. 
Height of shell, 30; of last whorl, 28; of aperture, 23; breadth, 23 mm. 
(Dali.) 
Type in Museum Cuming. Type locality, California. 
Range. Bering Island and the Okhotsk Sea on the west; on the east 
from Hagemeister Island and Bering Sea, south of the winter floe-line, 
and southeastward to California; Cerros Island, Lower California; Mazat- 
lan and Topolobampo, Mexico. 
Thais emarginata ostrina Gould, 1852 
Plate 36, fig. 1 
Mollusca and Shells of the United States Exploration Expedition, 244; PI. 18, figs. 
310, a-b. 
Testa parva, solida, rudis rotundato-ovato, patula, exalbida, purpuras- 
cens, interdum fasciis geminatis rubidis cincta; spira brevis, conica, an- 
fractibus quattuor vel quinque obtuse angulatis, convexis; ultimo amplis- 
simo, ventricoso; apertura rotundato-ovalis, livido-tincta; labro simplici, 
patente; columella excavato-planulata; sinu siphonali angusto, minime 
prof undo, brevi. 
Shell small, solid, broad-ovate, purplish, banded with brown lines, gen¬ 
erally in pairs, faintly marked with the lines of growth, and sometimes 
with obtuse revolving ribs. Whorls four or five, obtusely angular pos¬ 
teriorly, convex, the last comprising most of the shell, very broad-ovate. 
Aperture large, patulous, oval; inner lip expanding, smooth, simple, pillar 
broadly flattened, regularly arcuate, chestnut-colored; aperture livid chest¬ 
nut, paler near the lip. Length, nearly one inch; breadth, three-fifths of 
an inch. (Gould.) 
Type in State Museum, Albany, New York, Nos. 6358 and 2557. Type 
locality, Tillamook, Oregon. 
Range. Oregon to California. 
Thais emarginata projecta Dali, 1915 
Plate 37, figs. 4, 5 
Proceedings of the United States National Museum, 49:571; PI. 75, fig. 3. 
Shell thinner, more elongate, and with a pointed spire, the major and 
minor spirals more nearly equal, two strong spirals on the earlier whorls. 
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