NORTHWEST COAST MARINE SHELLBEARING MOLLUSKS. 147 

 ? SEMIBITTIUM CHALLISAE Bartsch, 1917. 



Troc. U. S. Nat. Mus., vol. 52, p. 673, pi. 47, lips. 2, 6. 

 San Juan Island, Gulf of Georgia. 



? SEMIBITTIUM SANJUANENSE Bartsch, 1917. 



Proc. U. S. Nat. Mus., vol. 52, p. 674, pi. 47, fig. 4. 

 San Juan Island, Gulf of Georgia. 



? SEMIBITTIUM SERRA Bartsch, 1917. 



Proc. U. S. Nat. Mus., vol. 52, p. 675, pi. 47, fig. 1. 



Off Point Pinos to San Diego, California, in 75 fathoms, and San Bartolome 

 Bay, Lower California. 



Subgenus Lirobittium Bartsch, 1911. 

 L1ROBITTIUM INTERFOSSA Carpenter, 1864. 



Supp!. Rep. Brit. Assoc, p. 656 ; Proc. U. S. Nat. Mus., vol 40, p. 401, pi. 51, 



figs. 2, 6. 

 Monterey to San Diego, California. 



LIROBITTIUM CATALINENSE Bartsch, 1907. 



Smithsonian Misc. Coll., vol. 50, p. 28, pi. 57, fig. 13. 

 Catalina Island to San Diego. Santa Barbara Pleistocene. 



LIROBITTIUM CATALINENSE INORNATUM Bartsch, 1911. 



Proc. U. S. Nat. Mus., vol. 40, p. 403, pi. 51, fig. 3. 

 Catalina Island to San Diego. Also Pleistocene. 



LIROBITTIUM ORNATISSIMUM Bartsch, 1911. 



Proc. U. S. Nat. Mus., vol. 40, p. 403, pi. 52, figs. 4, 5. 

 San Pedro, California. Santa Barbara Pleistocene. 



LIROBITTIUM MUNITUM Carpenter, 1864. 



Suppl. Rep. Brit. Assoc, pp. 628, 660 ; Proc. U. S. Nat. Mus., vol 40, pi. 53, 



figs. 1, 2. 

 Sitka Sound to Fuca Strait. 



LIROBITTIUM MUNITUM MUNITOIDE Bartsch, 1911. 



Proc U. S. Nat. Mus., vol. 40, p. 405, pi. 53, fig. 4. 

 San Pedro, California. 



LIROBITTIUM ASPERUM Gabb, 1861. 



Proc. Acad. Nat. Sci. Phila., p. 368; Proc. U. S. Nat. Mus., vol. 40, p. 405, 



pi. 56, fig. 3. 

 Pleistocene : Santa Barbara to San Diego. Also Pliocene. 



LIROBITTIUM ASPERUM LOMAENSE Bartsch, 1911. 



Proc U. S. Nat. Mus., vol. 40, p. 406, pi. 56, fig. 2. 

 Catalina Island to San Diego, California. 



LIROBITTIUM LARUM Bartsch, 1911. 



Proc U. S. Nat. Mus., vol. 40, p. 407, pi. 57, fig. 4. 



San Pedro, California, to San Bartolome Bay, Lower California. 



INSERTAE SEDIS. 

 BITTIUM OLDROYDI Bartsch, 1911. 



Proc. U. S. Nat. Mus., vol. 40, p. 408, pi. 51, fig. 5. 

 Destruction Island. Washington, to Lower California. 



