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CHAMIDAE 393
of the valves. The paUial Hne runs directly to the anterior muscle scar and
not past the end as in the other species. This is a reef species. An ecological
variety of heavy shell has been named fir7na Pilsbry and McGinty 1938.
Chama pellucida Broderip Clear Jevv^el Box
Oregon to Chile.
Plate 37a
I /4 to 3 inches in size, with frond-like, smoothish foliations. Color
opaque to translucent-white. Interior chalk-white, the margins minutely
toothed or crenulate. Commonly found attached to pilings, breakwaters and
floating wood. Also dredged down to 25 fathoms.
Genus Pseiidochama Odhner 191
These are mirror images of the chamas. According to Odhner, the anatomy
and prodissoconchs differ in the two genera.
Fseudocha77ia radia?js Lamarck Atlantic Left-handed Jewel Box
Southern Florida and the West Indies.
7
Plate 37c; figure 79c
I to 3 inches in size. This is the only species of Fsendochama in eastern
America. It is not very colorful, and ranges from a dull-white to a dull
purplish red. The interior is commonly stained with mahogany-brown.
Crenulations are present on the inner edges of the valves. In shape, it is a
mirror image of simwsa. P. ferriiginea Reeve is considered a synonym.
Common.
Pseudochama exogyra Conrad Pacific Left-handed Jewel Box
Oregon to Panama.
Similar to pellucida, but attached by the right valve which, when viewed
from the inside, is arched counterclockwise. The opaque whitish area inside
is generally not bordered by tiny crenulations. A common intertidal species.
Pseudochavia echinata Broderip in the Gulf of California is a popular
shell which is characterized by a watermelon-red hinge and purple-stained
interior.
Pseudochama grajiti Strong (Grant's Chama), dredged off central Cali-
fornia and Catalina Island, is about i inch in size, with prickly spines on the
underside of the attached, cup-formed valve. One end of the valve is tinted
with rose inside and out. Not common.