NORTHWEST COAST MARINE SHELLBEARING MOLLUSKS. 41 
Superfamily VENERACEA. 
Family VENERIDAE. 
Subfamily Dosiniinae. 
Genus DOSINIA Scopoli, 1777. 
Section DOSINIDIA Dali, 1902. 
DOSINIA PONDEROSA Gray, 1838. 
The Analyst, vol. 8, No. 24, p. 309. — Sowerby, Thes. Conch. Artemis, pi. 
140, fig. 2. 
San Diego, California, and south to Payta, Peru. 
Subfamily Meretricinae. 
Genus TIVELA Link, 1807. 
Subgenus Pachydesma Conrad, 1854. 
PACHYDESMA STULTORUM Mawe, 1823. 
Linn. Syst. Conch., p. 37, pi. 9, fig. 7 ; Proc. U. S. Nat. Mus., vol. 21, pi. 23, 
24, 25. 
Santa Cruz, California, and south to Socorro Island. 
Genus TRANSENNELLA Dali, 1883. 
TRANSENNELLA TANTILLA Gould, 1852. 
Boston Journ. Nat. Hist. vol. 6, p. 406, pi. 15, fig. 10; (separates, Apr. 1852). 
Sitka Harbor, Alaska, and south to Lower California. 
Genus AMIANTIS Carpenter, 1863. 
AMIANTIS CALLOSA Conrad, 1837. 
Journ. Acad. Nat. Sci., vol. 7, p. 252; Thes. Conch. Venus, pi. 114, figs. 44, 
45. 
San Pedro, California, to Gulf of Tehuantepec. 
Genus PITARIA (Roemer), 1857. 
PITARIA NEWCOMBIANA Gabb, 1865. 
Proc. Cal. Acad. Sci., vol. 3, p. 189 ; Proc. IT. S. Nat. Mus., vol. 15, pi. 23, fig. 4. 
Monterey, California, to the Gulf of California and Clarion Island. 
Genus ANTIGONA Schumacher, 1817. 
Section VENTRICOIA Roemer, 1857. 
ANTIGONA FORDI Yates, 1890. 
Santa Barbara Soc. Nat. Hist., Bull. No. 2, p. 46, pi. 1, figs. 1-5. 
Monterey, California, to Lower California. Panama? 
