190 BULLETIN 112, UNITED STATES NATIONAL MUSEUM. 
NUTTALLINA FLUXA Carpenter, 1864. 
Suppl. Rep. Brit. Assoc., p. 649. — Pilsbey, Man., vol. 14, pi. 54, figs. 21, 22 ; 
pi. 56, figs. 19, 20. 
Point Conception, California, to Gulf of California. 
NUTTALLINA THOMASI Pilsbry, 1898. 
Proc. Acad. Nat. Sci. Phila., p. 289. 
Monterey, California. 
Family ISCHNOCHITONIDAE. 
Genus ISCHNOCHITON Gray, 1847. 
Subgenus Stenoplax, Carpenter, 1878. 
STENOPLAX FALLAX Carpenter, 1892. 
Pilsbry, Man., vol. 14, p. 59, pi. 16, figs. 17-18., 
Vancouver Island to Todos Santos Bay, Lower California. 
STENOPLAX BIARCUATA Dall, 1903. 
Proc. Biol. Soc. Wash., vol. 16, p. 176. 
Santa Barbara to San Diego, California. 
Section STENOKADSIA Carpenter, 1878. 
STENOPLAX ACRIOR Carpenter, 1892. 
Pilsbry, Man., vol. 14, p. 61, pi. 14, figs. 86-89. 
San Miguel Island, California, to Gulf of California. 
STENOPLAX MAGDALENENSIS Hinds, 1843. 
Zool. Sulphur's Voy. Moll., p. 54, pi. 19, fig. 1. 
Coos Bay, Oregon, to Magdalena Bay, Lower California. 
STENOPLAX CONSPICUA Carpenter, 1892. 
Pilsbry, Man., vol. 14, p. 63, pi. 15, figs. 91-96. 
Monterey, California, to Gulf of California. 
STENOPLAX SARCOSA Dall, 1902. 
Proc. U. S. Nat. Mus., vol. 24, No. 1264, p. 558. 
San Pedro, California, to Gulf of California. 
Subgenus Ischnochiton s. l. 
ISCHNOCHITON MARMORATUS Dall, 1919. 
Proc. U. S. Nat. Mus., vol. 55, No. 2283, p., 503. 
Pacific Grove, Monterey Bay, California. 
ISCHNOCHITON BRYANTI Dall, 1919. 
Proc. U. S. Nat. Mus., vol. 55, No, 2283, p. 503. 
“ California ” ( Bryant ) . 
ISCHNOCHITON BRUNNEUS Dall, 1919. 
Proc. U. S. Nat. Mus., vol. 55, No. 2283, p, 504. 
San Diego, California. 
ISCHNOCHITON LISTRUM Dall, 1919. 
Proc. U. S. Nat. Mus., vol. 55, No, 2283, p. 504. 
San Diego, California. 
