Page:American Seashells (1954).djvu/540

442 2 to 4 inches in length, elongate-oval, fairly strong; the low beaks are nearer the anterior end. Sculpture of strong, irregular, concentric growth lines. Periostracum brownish gray, fairly thin and irregularly wrinkled. Exterior shell dirty-white or cream, and may have faint, narrow, radial rays of purple. Common offshore to 25 fathoms. Commonly washed ashore after storms, especially between Sea Beach and Huntington Beach, Cahfornia. The subgenus Gobraeus Leach 1852 is a later name for Fsammocola. Suborder ADAPEDONTA Superjaviily SOLE N ACE A Family SOLENIDAE Genus Siliqua Miihlfeld i 1 1 Shell commonly 6 inches in length, oval, compressed laterally; with a rather strais^ht, raised, internal rib ventrally directed. Hinq-e like Ensis. Siliqiia costata Sav Atlantic Razor Clam Plare ^of Gulf of St. Lawrence to New Jersey. 2 to 2/4 inches in length, ovate-elongate, compressed, fragile, smooth and with a shiny, green periostracum. Interior glossy, purplish white, with a strong, white, raised rib running down from the hinge to the middle of the anterior end. Very common on shallow-water sand-flats along the New England coast. Siliqiia squama Blainville found offshore from Newfoundland to Cape Cod is larger, thicker, white internally, and its internal, supporting rib slant- ing posteriorly instead of anteriorly as in costata. Uncommon. Siliqua hicida Conrad Transparent Razor Clam Bolinas Bay, California, to Lower California. I to I H inches in length. Very thin, fragile and translucent. A4oder- ately elongate. Shell whitish tan, with broad, indistinct, radial rays of darker tan or rosy purplish. Periostracum thin, ohve-green and varnish-like. Mod- erately common in sand at low tide to 25 fathoms. This species can be distinguished from the young of S. patula by its narrower and higher internal rib which crosses the shell at right-angles, and in being more arcuate on its ventral margin. Siliqua patula Dixon Alaska to Monterey, California. Pacific Razor Clam Plate 29y