182 bulletins" 112, UNITED STATES NATIONAL MUSEUM. 
Genus CYCLOSTREMA Marryatt, 1818. 
CYCLOSTREMA DIEGENSIS Bartsch, 1907. 
Proc. U. S. Nat. Mus., vol. 32, p. 172, fig. 7. 
San Diego, California. 
CYCLOSTREMA MIRANDA Bartsch, 1911. 
Proc. U. S. Nat. Mus., vol. 39, p. 230, pi. 39. figs. 1-3. 
San Pedro, California. 
CYCLOSTREMA BALDRIDGAE Bartsch, 1911. 
Proc. U. S. Nat. Mus., vol. 39, p. 229, pi. 39, figs. 7-9. 
San Pedro, California, to Gulf of California. 
Genus CIRCULUS Jeffreys, 1865. 
? CIRCULUS ROSSELLINUS Dali, 1919. 
Proc. U. S. Nat. Mus., vol. 56, No. 2295, p. 368. 
San Diego, California. 
CIRCULUS COSMIUS Bartsch, 1907. 
Proc. U. S. Nat. Mus., vol. 32, p. 173, fig. 8. 
Catalina Island. California, to Panama. 
Genus CYCLOSTREMELLA Bush, 1897. 
CYCLOSTREMELLA CALIFORNICA Bartsch, 1907. 
Proc. U. S. Nat. Mus., vol. 32, p. 174, fig. 10. 
San Pedro to San Diego, California. Pleistocene. 
CYCLOSTREMELLA CONCORDIA Bartsch, 1920. 
Journ. Wash. Acad. Sci., vol. 10, 1920^ 
Olga, Washington. 
Genus SCISSILABRA Bartsch, 1907. 
SCISSILABRA DALLI Bartsch, 1907. 
Proc. U. S. Nat. Mus., vol. 32, p. 176, fig. 11. 
Monterey, California, to Gulf of California. 
Genus LEPTOGYRA Bush, 1897. 
LEPTOGYRA ALASKANA Bartsch, 1910. 
Nautilus, vol. 23, No. 11, p. 136, pi. 11, figs. 4-6. 
Port Graham, Cooks Inlet, Alaska. 
Genus TEINOSTOMA A. Adams, 1854. 
TEINOSTOMA SUPRA VALLATA Carpenter, 1864. 
Suppl. Rep. Brit. Assoc., p. 652 ; Proc. Cal. Acad. Sci., vol. 3, p. 215. 
Monterey to the Gulf of California. 
TEINOSTOMA INVALLATA Carpenter, 1864. 
Suppl. Rep. Brit. Assoc., p. 652 ; Proc. Cal. Acad. Sci., vol. 3, p. 215. 
Monterey to Gulf of California. 
