16 RECENT BIVALVE MOLLUSKS 



Chlamys islandicus, var. bcrijigianus Middendorff, 1849. 



Bering Sea. 

 Chlamys paucicostatus Carpenter, 1864. 



Catalina Island, Cal., to Gulf of California. 



Section Patinopecten Dall, 1898. 



Chlamys caurinus Gould, 1850. 



AVrangell. Alaska, to Siletz Bay, Oregon. 



Section Leptopecten Verrill, 1897. 



Chlamys latiauritus Conrad, 1837. 



Monterey, Cal., to Lower California. 

 Chlamys latiauritus var. inonotiineris Conrad, 1837. 



Monterey, Cal., to the Gulf of California. 

 Chlamys latiauritus var. fucicohis Dall, 1898. 



On floating kelp. 

 Chlamys tumbezensis Philippi, 1846. 



Santa Barbara, Cal., to Peru. 



Section Plagioctenium Dall, 1898. 



Chlamys circularis Sowerby, 1835. 



Monterey, Cal., to Payta, Peru. 



Subgenus Pseudamusium H. & A. Adams, 1858. 



Pseudamusium randolphi Dall, 1897. 



Bering Sea to Guaymas, Mexico. 

 Pseudamiusium tillamookense Arnold, 1906. 



Pribiloff Islands, Bering Sea, to San Diego. 

 Pseudamusium vancouverense Wliiteaves, 1893. . 



Bering Sea to San Diego, Cal. 

 Pseudamusium davidsoni Dall, 1897. 



Davidson and Bowers Banks, Bering Sea. 

 Pseudamusium bistriatum Dall, 1916. 



OfT San Diego, Cal.. 822 fathoms. 

 Pseudamusium incongruum Dall, 1916. 



Ofif San Diego, Cal., in 684 fathoms. 



Subgenus Propeamusium Gregorio, 1883. 



Propeamusium alaskense Dall, 1871. 



Pribilofi:' Islands, Bering Sea, and southward to the Santa 

 Barbara Islands, California. Japan. 



