22 RECENT BIVALVE MO> USKS 



Sifbgeiiiis Allogramma Dail, 1903. 



Allogramma amabilis Dall, 1913. 



Off Santa Barl^ara Channel, Cal., 534 fathoms. 



Sitbo;cii!is Entodesma PhiHppi. 1845. 



Entodesma inflatum Conrad. 1837. 



In sponges. A'anconver Island to Guayaquil. 



Section Agriodesma Dall, 1909. 



Entodesma saxicola Baird. 1863. 



Aleutian Islands to San Pedro, Cal. 

 Entodesma scammoni Dall, 1871. 



Port Simpson, British Columbia, (Scammon). 



Genus Mytilimeria Conrad. 1837. 



Mytilimeria nuttallii Conrad, 1837. 



In compound Ascidians. \"ancouver Island to San Dieg-Q, 

 Cal. 



Sitpcrfamily Poromyacea 



Fa)jiily Poromyacidae 



Subgenus Dermatomya Dall, 1908. 



Dermatomya tenuiconcha Dall. 1913. 



Alaska Peninsula to Coronado Islands, in deep water. 

 Dermatomya buttoni Dall, 1916. 



Monterey, Cal., (Button). 

 Dermatomya beringiana Dall. 1916. 



Aleutian Islands to Tillamook, Oregon. 

 Dermatomya leonina Dall, 1916. 



Off coast of \\^ashington, 877 fathoms. 



Genus Cetoconcha Dall, 1886. 



Cetoconcha malespinae Dall, 1916. 



S. W. of Sitka, Alaska. 1579 fathoms. 



( ? ) Fomily Lyonsiellidae 

 Genus Lyonsiella M. Sars. 1872. 



Lyonsiella alaskana Dall. 1894. 



S. W. of Sitka. 1650 fathoms, and oft' Catalina Island, Cal., 

 in 600 fathoms. 



