146 BULLETIN 112, UNITED STATES NATIONAL MUSEUM. 
STYLIDIUM ESCHRICHTII ICELUM Bartsch, 1907. 
Proc. U. S. Nat. Mus., vol. 33, No. 1564, p. 178 ; vol. 40, pi. 57, fig. 3. 
Fuca Strait to Monterey, California. 
STYLIDIUM ESCHRICHTII MONTEREYENSE Bartsch, 1907. 
Proc. U. S. Nat. Mus., vol. 33, No. 1564, p. 178 ; vol. 40, p. 58, fig. 5. 
Crescent City, California, to Cape San Lucas. Also Pliocene. 
STYLIDIUM PAGANICUM Dali, 1919. 
Proc. U. S. Nat. Mus., vol. 56, p. 345. 
Off Monterey Bay, California, in 356 fathoms. 
Subgenus Semibittium Cossmann, 1896.. 
SEMIBITTIUM VANCOUVERENSE Dali and Bartsch, 1910. 
Canada Geol. Survey Mem., vol. 14 N, p. 10, pi. 1, fig. 8. 
Barkley Sound, Vancouver Island. 
SEMIBITTIUM ATTENUATUM Carpenter, 1864. 
Suppl. Rep. Brit. Assoc., p. 655 ; Proc. U. S. Nat. Mus., vol. 40, p. 393, pi. 54, 
figs. 1, 2, 5. 
Forrester Island, Alaska, to San Diego. V, /3aJc^^ 
SEMIBITTIUM ATTENUATUM BOREALE Bartsch, 1911. 
Proc. U. S. Nat. Mus., vol. 40, p. 395, pi. 54, fig. 4. 
Queen Charlotte Islands to Vancouver Island. 
SEMIBITTIUM ATTENUATUM MULTIFILOSUM Bartsch, 1907. 
Proc. U. S. Nat. Mus., vol. 40, p. 395, pi. 54, fig. 3. 
Monterey to San Pedro, California. 
SEMIBITTIUM ATTENUATUM LATIFILOSUM Bartsch, 1911. 
Proc. U. S. Nat. Mus., vol. 40, p. 395, pi. 54, fig. 6. 
San Pedro, California. 
SEMIBITTIUM SUBPLANATUM Bartsch, 1911. 
Proc. U. S. Nat. Mus., vol. 40, p. 395, pi. 57, fig. 5. 
Monterey Bay to South Coronado Island. 
SEMIBITTIUM RUGATUM Carpenter, 1866. 
Ann. Mag. Nat. Hist., ser. 3, vol. 18, p. 276; Proc. U. S. Nat. Mus., vol. 40, 
p. 397, pi. 56, figs. 4, 5. 
San Pedro and Catalina Island. Santa Barbara Pleistocene. 
SEMIBITTIUM QUADRIFILATUM Carpenter, 1864. 
Suppl. Rep. Brit. Assoc., p. 655 ; Proc. U. S. Nat. Mus., vol. 40, p. 398, pi. 
58, figs. 2, 3, 1911. 
Monterey, California, to San Ignacio Lagoon, Lower California. 
? SEMIBITTIUM ARMILLATUM Carpenter, 1864. 
Suppl. Rep. Brit. Assoc., p. 655 ; Proc. U. S. Nat. Mus., vol. 40, p. 391, pi. 
52, fig. 6. 
Santa Barbara and San Pedro, California. Pleistocene. 
\ 
? SEMIBITTIUM PURPUREUM Carpenter, 1864. 
Suppl. Rep. Brit. Assoc., p. 660; Proc. U. S. Nat. Mus., vol. 40, pi. 52, 
figs. 1, 3. 
Monterey to San Diego, California. 
