42 RECENT BIVALVE MOLLUSKS 



Panomya ampla Dall, 1898. 



Arctic Ocean north of Bering- Strait, Bering Sea. Aleutian 

 Islands and eastward to Kadiak Island, Alaska. 



Genus Saxicavella Alartens, 1885. 



Saxicavella pacifica Dall, 1916. 



Off Point Loma, San Diego. 131 fathoms. 



Genus Cyrtodaria Daudin. 1799. 



Cyrtodaria kurriana Dunker, 1862. 



Arctic Ocean and south to Norton Sound, Alaska ; also on 

 the west coast of Greenland. 



Genus Saxicava Fleuriau. 1802. 



Saxicava arctica Linne, 1767. 



Arctic Ocean to Panama. Also Atlantic. 

 Saxicava pholadis Linne, 1771. 



Arctic Ocean to Panama. Also Atlantic. 



Super family Adesmacea 



Family Pholadidse 



Subfamily Pholadinae 



Genus Barnes. (Leach) Risso, 1826. 



Barnea pacifica Stearns. 1871. 



San Francisco Bay. to Lower California. 



Genus Ziviaea. (Leach) Gray, 1847. 



Zirfaea gabbi Try on, 1873. 



Bering Sea and islands and south to San Diego, Gal. 



Subfamily Jouannetinae. 

 Genus Parapholas Conrad. 1848. 



Parapholas californica Conrad, 1837. 

 Monterey to San Diego, Gal. 



Genus Pholadidea Turton, 1819. 



Pholadidea penita Conrad, 1837. 



Chirikoff Islands, Alaska, and south to San Pedro, Gal. 

 Pholadidea penita var. concamerata Deshayes, 1839. 



Bering Sea and islands and south to San Diego, Gal, 

 Pholadidea penita var. sagitta Stearns, 1916. 



Puget Sound to Socorro Island. 



