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American Seashells
fragile. Beaks small, % the distance back from the anterior end. Dorsal mar-
gin of valves pushed in, both in front and back of the beaks. There is no
thickening of the hinge line directly below the beaks. Color white, with
a thin, nut-brown, smoothish periostracum. Moderately common attached
to buoys, eel-grass and wharf pilings.
Figure 8o. Pacific Lepton Clams, a, Fsendopythhia rugifera Cpr., % inch, attached
to the underside of a crawfish; b, Mysella tmnida Cpr., % inch; c, animal
of the clam, Bortiia longipes Stimpson, ^ inch (Carolinas).
Mysella golischt Dall
Southern third of California.
Golisch's Lepton
/4 inch in length, oval-oblong in side view, moderately compressed and
rather fragile. Beaks small, % the distance back from the anterior end. The
dorsal margin of the valve is pushed in slightly just anterior to the beak.
Shell white, semi-transparent, with its glossy exterior having irregular, con-
centric wrinkles. In live specimens, there is a thin yellowish brown periostra-
cum. These clams are found attached to the gills or legs of the large sand
crab, Blepharopoda occidentalis. Common, M. pedroaiia Dall, known from