NORTHWEST COAST MARINE SHBLLBEARING MOLLUSKS. 57 
Class SCAPHOPODA. 
Order SOLENOCONCHA. 
Family DENTALIIDAE. 
Genus DENTALIUM Linnaeus, 1758. 
DENTALIUM INVERSUM Deshayes, 1825. 
Mem. Soc. Hist. Nat., Paris, vol. 2, p. 270, pi. 16, figs. 21, 22. 
Bering Sea to Panama in increasingly deep water. 
DENTALIUM NEOHEXAGONUM Sharp and Pilsbry, 1897. 
Man. Conch., vol. 17, p. 19, pi. 11, figs. 74-86. 
Monterey to Guacomayo, Central America. 
DENTALIUM SEMIPOLITUM Broderip and Sowerby, 1829. 
Zool. Joiirn., vol. 4, p. 369.— Pilsbey, Man. Conch., vol. 17, pi. 16, fig. 54. 
San Pedro, California, to Mazatlan, Mexico. 
DENTALIUM DALLI Pilsbry and Sharp, 1897. 
Man. Conch., vol. 17, pi. 21, fig. 46. 
Pribilof Islands, Bering Sea, to Point Aguja, Pern. 
DENTALIUM RECTIUS Carpenter, 1864. 
Suppl. Rep. Brit. Assoc., for 1863, p. 648. — Pilsbry, Man. Conch., vol. 17, 
pi. 21, fig. 45. 
Stephens Passage, Alaska, to Panama Bay. 
DENTALIUM WATSONI Sharp and Pilsbry, 1897. 
Man. Conch., vol. 17, p. 113, pi. 21, fig. 44. 
Tillamook, Oregon, to San Diego, California. 
DENTALIUM (OERSTEDTII Morch, var.?) NUMEROSUM Dali, 1897. 
Pilsbry, Man. Conch., vol. 17, p. 25, pi. 10, figs. 70-73. 
Coronado Islands and south to Panama and the Galapagos Islands, in deep 
water. 
DENTALIUM AGASSIZII Pilsbry and Sharp, 1897. 
Man. Conch., vol. 17, p. 26, pi. 12, figs. 90-94. 
Santa Barbara Islands, California, to Panama. 
DENTALIUM FISHERI (Steams) Pilsbry, 1897. 
Man. Conch., vol. 17, p. 36, pi. 5, figs. 61-65. 
Los Animas Bay, California, to Gulf of California. 
DENTALIUM VALLICOLENS Raymond, 1904. 
Nautilus, vol. 17, p. 123. <. 
Puca Strait to Gulf of California. 
DENTALIUM PRETIOSUM Sowerby, 1860. 
Thes. Conch., p. 95, pi. 225, fig. 57. 
Forrester Island, Alaska, to San Diego, California. 
