TOPS AND TURBANS 



233 



Fig. 231. X f (*) 



Callio stoma s pi end ens ^ 

 Cpr., the Shining Top- 

 shell, is shown very 

 greatly magnified in Fig- 

 ure 231. This species of 

 mollusk has a small shell, 

 about the size ot a small 

 pea. It is of an orange- 

 chestnut color, with fleshy 

 or bluish nacre. It is a 

 rare shell, found at Mon- 

 terey and southward and has sometimes been con- 

 sidered to be only a variety of C. costatuni. 



T'urcia cajfea^ Gabb, the Coffee-brown Top-shell, 

 {T'haliota caffea). This is a rare shell, resembling 

 a Calliostoma, but it has two folds on the colu- 

 mella, which forms a distinguishing mark. The 

 whorls are flattened, the sutures deep and bearded, 

 the epidermis coffee-brown in color, and the nacre, 

 or mother-of-pearl, of a greenish tint. Its greatest 

 height is 19 mm. Its home is on the California coast. 

 Margarites pupilla^ Gld., the Little 

 Margarites, {Margarita pupilla). Figure 

 232, is a northerner living in Puget Sound, 

 but sometimes coming further south. It 

 is yellowish brown or ashen in color, and its four 

 whorls are marked with spiral ridges. The umbili- 

 cus is distinct, but small, and the aperture is nearly 

 circular. Its height is sometimes as great as half an 

 inch. 



Margarites helicina, Fabr., the Helix Margarites, 

 {Margarita helicina)^ is decidedly arctic in its 



Fig. 232 



