158 BULLETIN 112, UNITED STATES NATIONAL MUSEUM. 
NODULUS KYSKENSIS Bartsch, 1911. 
Proc. U. S. Nat. Mus., voL 41, p. 291, fig. 4. 
Kyska and Atka Islands, Aleutians. 
NODULUS PALMERI Dali, 1919. 
Proc. Biol. Soc. Wash., vol. 32, p. 251. 
Pribilof Islands, Bering Sea. 
Genus SKENEOPSIS Iredale, 1915. 
SKENEOPSIS ALASKANA Dali, 1919. 
Proc. Biol. Soc. Wash., vol. 32, p. 251. 
Pribilof and Unalaska Islands, Alaska. 
Genus AMPHITHALAMUS Carpenter, 1865. 
AMPHITHALAMUS INCLUSUS Carpenter, 186^. 
Ann. Mag. Nat. Hist., ser. 3, vol. 15, p. 181 ; Proc. U. S. Nat. Mus., vol. 41, 
p. 264, fig. 2. 
Catalina Island to San Diego, California. 6 
AMPHITHALAMUS LACUNATUS Carpenter, 1866. 
Proc. Cal. Acad. Sci., vol. 3, p. 218 ; Proc. U. S. Nat. Mus., vol. 41, p. 263, 
fig. 1. 
San Pedro, California. . 
AMPHITHALAMUS TENUIS Bartsch, 1911. 
Proc. U. S. Nat. Mus., vol. 41, p. 264, fig. 3. 
Monterey to San Diego, California. 
Genus ALVANIA (Leach) Risso, 1826. 
ALVANIA CASTANELLA Dali, 1886. 
Proc. U. S. Nat. Mus., vol. 9, p. 307, pi. 3, fig. 5. 
Kyska to Atka Island, Aleutians. 
ALVANIA AURIVILLII Dali, 1886. 
Proc. U. S. Nat. Mus., vol. 9, p. 308, pi. 4, fig. 8. 
Kyska to Adakh Island, Aleutians. 
ALVANIA BAKERI Bartsch, 1910. 
Nautilus, vol. 23, No. 11, p. 137, pi. 11, fig. 8. 
Port Graham, Cook’s Inlet, Alaska. 
ALVANIA TRACHISMA Bartsch, 1911. 
Proc. U. S. Nat. Mus., vol. 41, p. 339, pi. 29, fig. 7. 
Monterey, California. 
ALVANIA CALIFORNICA Bartsch, 1911. 
Proc. U. S. Nat. Mus., vol. 41, p. 340, pi. 29, fig. 9. 
Monterey, California. 
ALVANIA CARPENTERI Weinkauif, 1885. 
Conch. Cab., ed. 2 p. 192 ; Proc. U. S. Nat. Mus., vol. 41, pi. 29, fig. 8. 
Forrester Island, Alaska, to Neah Bay, Washington. 
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AtAi', /3, e. 
