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MURICIDAE 215<br />

with rounded, spiral ridges. Sometimes imbricated with small scales (form<br />

named inibricata Lamarck, pi. 256). Color usually dull-white, but sometimes<br />

yellowish, orange or brownish. Rarely with dark-brown or blackish spiral<br />

bands. This species has also been known as Nucella lapillus. For biology see<br />

H. B. Moore (1936 and 1938).<br />

Figure 48. Pacific coast Dogwinkles. a, Thais emarginata Deshayes; b and c,<br />

T. cmialicidata Duclos; d, T. lima Gmelin; e to h, forms of T. lainellosa Gmelin.<br />

Thais lamellosa Gmelin<br />

All about natural size.<br />

Bering Straits to Santa Cruz, California.<br />

Frilled Dogwinkle<br />

Figures 48e-h<br />

I % to 5 inches in length, solid, usually with a fairly high, pointed spire.<br />

Columella almost vertical and straight, not flattened. Size, details of shape,<br />

sculpturing and color very variable. White, grayish, cream or orange, some-<br />

times spirally banded. Smoothish or with variously developed foliated, axial<br />

ribs. Sometimes spinose. A very common rock-loving species. Formerly<br />

Purpura crispata Martyn.

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