TOPS AND TURBANS 



231 



Fig. 226 



smaller shell. It is light chestnut-brown in color, 



with a peripheral circle of alternating chestnut and 



white spots. It is found in the south, especially on 



the breakwater at San Pedro, and may be known 



as the Granose Top-shell. 



Calliostonia tricolor, Gabb, the 



Three-colored Top-shell, is well 



shown in Figure 226, while Figure 



227 gives a magnified view of another 



specimen. The shell is conical, its 



five whorls little raised but marked 



with delicate spiral sculpturing. The 



background of yellowish 

 gray is ornamented with 

 fine spiral threads of 

 color, broken into alter- 

 nate joints of purple and 

 white, thus giving it the 

 three-colored aspect. It 

 is a southern shell and is 



Fig. 227. X \ (*) 



obtained by dredging. 

 Figure 226 represents 

 a large specimen. 



Calliostoma varie- 

 gatmii, Cpr., the Va- 

 riegated Top-shell, 

 Figure 228, was origi- 

 nally described from a 

 very small specimen 

 taken in Puget Sound. 



Fig. 228, X I (*) 



