48 
BULLETIN 112, UNITED STATES NATIONAL MUSEUM. 
MACOMA EXPANSA Carpenter, 1864. 
Suppl. Rep. Brit. Assoc., p. 639 ; Proc. Acad. Nat. Sci. Phila. for 1865, p. 56. 
Puget Sound to La Jolla, California. 
MACOMA YOLDIFORMIS Carpenter, 1864. 
Suppl. Rep. Brit. Assoc., p. 639; Proc. Acad. Nat. Sci. Phila. for 1865, p. 55. — 
Arnold, Pal. San Pedro, pi. 16, fig. 6. 
Fuca Strait to San Diego, California. 
MACOMA TRUNCARIA Dali, 1916. 
Proc. U. S. Nat. Mus., vol. 52, No. 2183, p. 414. 
Island near Cape Halkett, Arctic Ocean. 
MACOMA ALASKANA Dali, 1900. 
Proc. U. S. Nat. Mus., vol. 23, p. 323, pi. 3, fig. 5. 
Lituya Bay, to Gulf of Georgia. 
Section REXITHAERUS Conrad, 1869. 
MACOMA INDENTATA Carpenter, 1864. 
Suppl. Rep. Brit. Assoc., p. 639; Proc. Cal. Acad. Sci., vol. 3, p. 208. — Arnold, 
Pal. San Pedro, pi. 16, fig. 1. 
Puget Sound to Lower California. 
MACOMA INDENTATA TENUIROSTRIS Dali, 1900. 
Proc. U. S. Nat. Mus., vol. 23, No. 1210, p. 324. 
San Pedro and the Santa Barbara Islands, to San Diego (Kelsey). 
MACOMA SECTA Conrad, 1837. 
Journ. Acad. Nat. Sci. Phila., vol. 7, p. 257 ; Thes. Conch., Tellina, pi. 65, 
figs. 245, 248. 
Vancouver Island and south to the Gulf of California. .Japan ? 
Family SEMELIDAE. 
Genus SEMELE Schumacher, 1817. 
SEMELE DECISA Conrad, 1837. 
Journ. Acad. Nat. Sci. Phila., vol. 7, p. 239, pi. 19, fig. 2. 
San Pedro to San Diego, California. 
CUrKJojoS . M ff, ee U, 
SEMELE STRIOSA C. B. Adams, 1852. 
Panama Shells, p. 291. 
Catalina Island, California, to Panama. 
SEMELE RUPICOLA Dali, 1915. 
Proc. Acad. Nat. Sci. Phila. for 1915, p. 26. 
Santa Cruz, California, to Gulf of California. 
SEMELE RUBROPICTA Dali, 1871. 
Amer. Journ. Conch., vol. 7, p. 144, pi. 14, fig. 10. 
Forrester Island, Alaska, to Tia Juana, Lower California. 
SEMELE PACIFICA Dali, 1915. 
Proc. Acad. Nat. Sci. Phila. for 1915, p. 27. 
Catalina Island, California, to Acapulco. 
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