442 



Av] eric an Seas bells 



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 



