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396 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, at- tached 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