NORTHWEST COAST MARINE SHELLBEARING MOLLUSKS. 47 
MACOMA CALCAREA Gmelin, 1792. 
Syst. Nat., vol. 7, p. 3236 ; Conch. Cab., ed. 1, vol. 6, p. 140, pi. 13, fig. 136. 
Arctic Ocean to North Japan and to Monterey Bay, California. Circum- 
boreal. 
MACOMA MOESTA Deshayes, 1854. 
Proc. Zool. Soc., p. 361 ; Proc. U. S. Nat. Mus., vol. 23, pi. 4, fig. 8. 
Arctic Ocean, Bering Sea and eastward to the Shnmagin Islands. Cir- 
cumboreal. 
MACOMA NASUTA Conrad, 1837. 
Journ. Acad. Nat. Sci. Phila., vol. 7, p. 258 ; Thes. Conch., TelUna, p. 314, pi. 
64, fig. 224. 
Kodiak Island and Cook’s Inlet, Alaska, south to Scammon Lagoon, Lower 
California. 
MACOMA INQUINATA Deshayes, 1854. 
Proc. Zool. Soc., p. 357 ; Conch. Icon., TelUna, pi. 30, fig. 164. 
Bering Strait to Japan on the west and to Monterey Bay, California, on the 
east. 
MACOMA INQUINATA ARNHEIMI Dali, 1916. 
Proc. U. S. Nat. Mus., vol. 52, No. 2183, p. 414. 
Kodiak Island, Alaska, and south to San Francisco Pleistocene of San 
I*edro. 
MACOMA BALTHICA Linnaeus, 1758. 
Syst. Nat., ed. 10, p. 677 ; Thes. Conch., TelUna, pi. 59, fig. 121. 
Circumboreal. Point Barrow, Arctic Ocean to North Japan and San Diego, 
California. 
MACOMA INFLATULA Dali, 1897. 
Bull. Nat. Hist. Soc. Brit. Col., No. 2, p. 11, pi. 1, figs. 19, 20. 
Arctic Ocean and south to Ballenas Lagoon, Lower California. 
MACOMA LEPTONOIDEA Dali, 1895. 
Proc. U. S. Nat. Mus., vol. 23, pp. 308, 323, pi. 4, figs. 4, 9. 
Santa Barbara Channel. Also Texas coast. 
MACOMA ONEILLI Dali, 1919. 
Sci. Res. Canadian Arctic Exp., vol. 8, pt. A., p. 20A, pi. 2, fig. 1. 
Dolphin and Union Straits, Arctic Coast. 
MACOMA KELSEYI Dali, 1900. 
Trans. Wagner Inst, vol. 3, p. 1052, pi. 49, fig. 7. 
Pleistocene, San Diego, California. Recent? 
MACOMA QUADRANA Dali, 1916. 
Proc. U. S. Nat. Mus., vol. 52, No. 2183, p. 414. 
Boca de^Quadra, Alaska, and south to Coronado Islands, Lower California. 
MACOMA CARLOTTENSIS Whiteaves, 1880. 
Rep. Progress Geol. Surv. Canada, 1879-80, p. 196 B, fig. 1. 
Arctic Ocean to Puget Sound. 
MACOMA LIOTRICHA Dali, 1897. 
Nat. Hist. Soc. Brit. Col., Bull. No. 2, p. 12, pi. 1, fig. 21. 
Aleutian Islands and eastward to the Shumagin Islands, Alaska. 
