CLASS GASTROPODA 
127 
Polinices lewisii Gould, 1847 
Proceedings of the Boston Society of Natural History, 2:239. Mollusca and Shells of 
the United States Exploring Expedition, fig. 293. 
Testa praegrandis, solidiuscula, conico-globosa, albida, epidermide sor- 
dide stramineo induta, lineis minimis confertissimis, flexuosis cincta; spira 
anfractibus sex ventricosis postice valde constrictis; apertura obovata, 
ampla, callo copioso albo castaneo-tincto umbilicum modicum simplicem 
profundum postice circumambiente, ad anfractum ultinnim munita; fauce 
incarnate. Operculum corneum. (Gould.) 
Shell very large, not very ponderous, globose-conic; the spire rather 
elevated and acute; color pale fleshy, covered by a thin, ashy epidermis, 
which is everywhere marked with very delicate, crowded, undulating, re¬ 
volving lines. Surface somewhat undulated, by the stages of growth. 
Whorls six, moderately convex, somewhat flattened near the suture, the 
last whorl having a very remarkable broad, well-marked constriction, at 
about its posterior third, which is continued also about the middle of the 
posterior whorls. Aperture obovate, broad, having a sharp lip, until it 
rises on the left margin, when it widens, and presents a rounded edge, 
terminating in a copious white callus, which seems to flow down about half¬ 
way around the umbilicus without closing it, and having a furrow running 
obliquely inward, from the upper edge of the umbilicus; its edges are 
somewhat tinted with chestnut, and a strong band of callus also fills the 
upper angle of the aperture. Umbilicus moderately long, deep, nearly 
round, with a slight encroachment down the right wall. Interior of the 
aperture shaded with pale flesh-color. Operculum thin, horny. Axial 
diameter, 4^-5; transverse diameter, 4 in. (Gould.) 
Type in United States National Museum? Type locality, Discovery 
Harbor, Puget Sound. 
Range. Nanimo, British Columbia, to San Pedro, California. 
Polinices caurinus Gould, 1847 
Proceedings of the Boston Society of Natural History, 2:239. Mollusca and Shells of 
the United States Exploring Expedition, fig. 254. 
Testa parva, solida, laevigata globoso-ellipsoidea, albida, epidermide 
tenui stramineo induta, vix perforata: spira obtusa, erosa, anfractibus 
quatuor cum dimidio, ultimo sub-tabulato, antice subcontractor apertura 
parva, semilunaris; columella recta, postice callo copioso albo induta. 
(Gould.) 
Shell small, solid, smooth, of a round-ellipsoid form, of a dead, dirty 
milk-white color. Whorls four or five, the upper ones forming a depressed 
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