MURICIDAE 



215 



with rounded, spiral ridges. Sometimes imbricated with small scales (form 

 named inibricata Lamarck, pi. 256). Color usually dull-white, but sometimes 

 yellowish, orange or brownish. Rarely with dark-brown or blackish spiral 

 bands. This species has also been known as Nucella lapillus. For biology see 

 H. B. Moore (1936 and 1938). 



Figure 48. Pacific coast Dogwinkles. a, Thais emarginata Deshayes; b and c, 

 T. cmialicidata Duclos; d, T. lima Gmelin; e to h, forms of T. lainellosa Gmelin. 



All about natural size. 



Thais lamellosa Gmelin 



Bering Straits to Santa Cruz, California. 



Frilled Dogwinkle 



Figures 48e-h 



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

 Columella almost vertical and straight, not flattened. Size, details of shape, 

 sculpturing and color very variable. White, grayish, cream or orange, some- 

 times spirally banded. Smoothish or with variously developed foliated, axial 

 ribs. Sometimes spinose. A very common rock-loving species. Formerly 

 Purpura crispata Martyn. 



