242 WEST AMERICAN SHELLS 
ules appear too prominent. The color of speci- 
mens found in Monterey Bay is light salmon, 
while around the sutures and the angle of the lower 
whorl is a chain of roundish, dark spots, with the 
lighter spaces between them. In San Pedro Bay 
the shells are darker. The height of a grown speci- 
men is fully an inch. 
In West Coast Shells this species was called 
C. supragranosum, Cpr. The latter name, how- 
ever, proves to belong to a rare species, having a 
much smaller shell, ight chestnut-brown in color, 
with a peripheral circle of alternating chestnut 
and white spots. It is found only in the south, 
and may be called the Granose Top-shell. 
Callidstoma tricolor, Gabb, the 
Three-colored 'Top-shell, is well 
shown in Figure 269, while Figure 
270 gives a magnified view of 
another specimen. The shell is coni- 
eal, its five whorls little raised, but Hig 6260 
marked with delicate 
spiral sculpturing. The 
background of yellow- 
ish gray is ornamented 
with fine spiral threads 
of color, broken into 
alternate joints of pur- 
ple and white, thus giv- 
ing it the three-colored 
aspect. It is a southern shell, and is obtained by 
dredging. Figure 269 represents a large specimen. 
Fig. 270, x 2 (*) 
