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 Dall, 1919. 



Proc. Biol. Soc. Wash., vol. 32, p. 251. 

 Pribilof Islands, Bering Sea. 



Genus SKENEOPSIS Iredale, 1915. 



SKENEOPSIS ALASKANA Dall, 1919. 



Proc. Biol. Soc. Wash., vol. 32, p. 251. 

 Pribilof and Unalaska Islands, Alaska. 



Genus AMPHITHALAMUS Carpenter, 1865. 



AMPHITHALAMUS INCLUSUS Carpenter, 1865. 



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. 



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 Dall. 1886. 



Proc. U. S. Nat. Mus., vol. 9. p. 307, pi. 3, fig. 5. 

 Kyska to Atka Island, Aleutians. 



ALVANIA AURIVILLII Dall, 1886. 



Proc. U. S. Nat. Mus., vol. 9, p. 30S, 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 Weinkauff, 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. 



