CHAPTER V 
OTHER BIVALVE MOLLUSKS 
While re- 
turning one 
mG na nig 
from a ram- 
ble over the 
rocks — that 
had been left 
bare by the 
fall of the 
tide, I was 
much — sur- 
prised to see 
what seemed to be two white worms moving about 
in a little hollow between two mossy rocks, which 
was filled with sand and seawater. They were 
long and round, and about the size of a lead pencil. 
As soon as I disturbed them a little they disap- 
peared beneath the surface of the wet sand. Sus- 
pecting what these singular creatures might 
belong to, I at once began to dig, and soon came 
upon a fine clam, with a shell lke that shown in 
Figure 65. I was exceedingly glad to make the 
acquaintance of a real, live Psammobia califor- 
nica, the California Sand-shell (P. rubro-radiata), 
for so I learned to call him. As I wanted to see 
