THE SMALLER, SEA-SHELLS 197 
The color of the shell is gray. This fine species 
lives in southern waters, and I have collected beau- 
tiful specimens at San Pedro. 
Urosalpina cinéreus, Say, the Oyster Drill, is an 
eastern species found in San Francisco Bay, es- 
pecially around the oyster beds. It was probably 
introduced with young oysters from the Atlantic 
and has now become quite common. In size and 
appearance it considerably resembles Murex cir- 
cumtexta, Figure 196, but the shell is thinner, and 
the spire longer and more pointed. As the name in- 
dicates, the shell is ash-colored, though it is red- 
dish internally. Specimens may easily be eap- 
tured at low tide, and often the little egg-vases 
may be observed, attached to stones or posts. 
Trophon_ beélcheri, 
Hds., Belcher’s Tro- 
phon (Chorus belcher1). 
The large mollusk whose 
shell is so well shown in 
Figure 206 is found 
chiefly on the coast of 
southern California. It 
is one of our largest 
shells, the picture be- 
ing much smaller than 
the real shell, and speci- 
mens have been found 
which were fully six in- 
ches in length. The 
color is dull white, 
somewhat tinged with brown. Specimens may 
=e 2 
Fig. 206, x 4 
