36 RECENT BIVALVE MOLLUSKS 



Peronidia lutea Gray, 1828. 



Arctic Ocean, Bering Sea, North Japan, the Aleutian 



Islands and east to Cook's Inlet, Alaska. 

 Peronidia lutea var. venulosa Schrenck, 1861. 



Shumagin Islands, Alaska; Sakhalin Island, Japan. 



Genus Metis H. & A. Adams, 1856. 



Metis alta Conrad. 1837. 



Santa Barbara, Cal., to San Diego. 



Genus Macoma Leach, 1819. 



Macoma middendorffii Dall. 1886. 



Bering Strait, south to the Commander and Aleutian 



Islands and eastward to Chirikoff Island, Alaska. 

 Macoma incongrua Martens, 1865. 



Arctic Ocean, south to Japan on the west and to San 



Diego, Cal., on the east. 

 Macoma brota Dall, 1916. 



Arctic Ocean. Bering Sea and south to Puget Sound. 

 Macom,a brota var. lipara Dall, 1916. 



Bering Sea to Puget Sound. 

 Macoma sitkana Dall, 1900. 



Kadiak Island to Lituya Bay and Sitka, Alaska. 

 Macoma calcarea Gmelin, 1792. 



Arctic Ocean to North Japan and to Monterey Bay, Cal. 



Circumboreal. 

 Macoma moesta Deshayes, 1854. 



Arctic Ocean, Bering Sea and eastward to the Shumagin 



Islands. Circumboreal. 

 Macoma nasuta Conrad, 1837. 



Kadiak Island and Cook's Inlet, Alaska, south to Scam- 



mon Lagoon, Lower California. 

 Macoma inquinata Deshayes, 1854. 



Bering Strait to Japan on the west and to Monterey Bay, 



Cal., on the east. 

 Macoma inquinata var. arnhcimi Dall, 1916. 



Kadiak Island, Alaska, and south to San Francisco. 



Pleistocene of San Pedro, Cal. 

 Macoma balthica Linne, 1758. 



Circumboreal. Point Barrow, Arctic Ocean to North 



Japan and San Diego, Cal. 

 Macoma inflatula Dall, 1897. 



Arctic Ocean and south to Ballenas Lagoon, Lower Cal. 

 Macoma leptonoidea Dall, 1895. 



Santa B.arbara Channel. Also Texas coast. 



