26 RECENT BIVALVE MOLLUSiKS 



Genus Milneria Dall, 1881. 



Milneria minima Dall, 1871. 



Monterey to Todos Santos Bay, Lower Cal., on Haliotis. 

 Milneria kelseyi Dall, 1916. 



Monterey to Point Abreojos. Lower Cal. 



Siipcrfaiiiily Chamacea 



Family Chamidse 



Geiuts Chama Linne, 1758. 



Chama pellucida Broderip, 1834. 



Oreg-on to Chile, and Galapagos Islands. 

 Chama exogyra Conrad, 1838. 



Oregon to Panama. 

 Chama frondosa Broderip, 1834. 



San Diego, Cal., to Peru. 

 Chama buddiana C. B. Adams. 1850. 



Monterey, Cal., to Panama. 



Superfamily Lucinacea 



Family Thyasiridse 



Genus Thyasira (Leach in) Lamarck, 1818. 



Thyasira bisecta Conrad, 1849. 



Off Alaska Peninsula and southward to Puget Sound. 



Also Miocene and Pliocene. 

 Thyasira gouldii Philippi, 1845. 



Bering- Strait to San Diego. Also Atlantic. 

 Thyasira trisinuata Orbigny, 1846. 



Sitka. Alaska, to San Diego, Cal. Also Atlantic. 

 Thyasira trisinuata var. polygona Jeffreys, 1863. 



Korea. Gulf of Alaska to San Diego. Also Atlantic. 

 Thyasira cygnus Dall, 1916. 



Southeastern Alaska. 

 Thyasira barbarensis Dall, 1889. 



Fuca Straits to Gulf of California. 

 Thyasira excavata Dall, 1901. 



Oregon to Gulf of California. 

 Thyasira tricarinata Dall, 1916. 



Off Santa Barbara Islands, Cal., in 1100 fathoms. 



Subi^enus Axinulus A'errill & Bush, 1898. 



Axinulus ferruginosus Forbes, 1844. 



Aleutian Islands. Also Atlantic and Arctic. 



