NORTHWEST COAST MARINE SHELLBEARING MOLLUSKS. 55 
Genus SAXICAVA Fleuriau, 1802. 
SAXICAVA ARCTICA Linnaeus, 1767. | 
Sys. Nat, ed. 12, p. 1113; Thes. Conch., Saxicava, pi. 471, 'fig. 1 . — Saes, 
Moll. Reg. Arct. Norv., pi. 20, figs. 8 a-h. i'uo.). 
Arctic Ocean to Panama. Also Atlantic. 
SAXICAVA PHOLADIS Linnaeus, 1771. 
Mantissa, vol. 2, p. 548. — Saks, Moll. Reg. Arct. Norv., pi. 20, figs. 7 a-&. 
Arctic Ocean to Panama. Also Atlantic. 
Superfamily ADESMACEA. 
Family PHOLADIDAE. 
Subfamily PHOLADINAE. 
Genus BARNEA (Leach) Risso, 1826. 
8ARNEA PACIFICA Stearns, 1871. 
Prel. Descr., Aug. 1871, p. 1 ; Proc. Cal. Acad. Sci., vol. 5, p. 81, pi. 1, figs. 
6, 6 a~c., 1873. 
San Francisco Bay to Lower California. 
Genus ZIRFAEA (Leach) Gray, 1847. 
ZIRFAEA GABBI Tryon, 1863. 
Proc. Acad. Nat. Sci. Phila. for 1863, p. 144, pi. 1, fig. 1. 
Bering Sea and islands and south to San Diego, California. 
^ rn Hr 
Subfamily JOUANNETINAE. 
Genus PARAPHOLAS Conrad, 1848. 
PARAPHOLAS CALIFORNICA Conrad, 1837. 
Journ. Acad. Nat. Sci. Phila., vol. 7, p. 236, pi. 18, fig. 5. 
Monterey to San Diego, California. 
Genus PHOLADIDEA Turton, 1819. 
PHOLADIDEA PENITA Conrad. 1837. 
Journ. Acad. Nat. Sci. Phila., vol. 7, p. 237, pi. 18, fig. 7. 
Chirikoff islands, Alaska, and south to San Diego, California. 
PHOLADIDEA PENITA CONCAMERATA Deshayes, 1839. 
Rev. Zool. Soc. Cuvierienne, p. 324. — Gueein, Mag. Zool. 1840, Moll., pi. 17. 
Bering Sea and islands and south to San Diego, California. 
PHOLADIDEA PENITA SAGITTA Steams, 1916. 
Proc. U. S. Nat. Mus., vol. 52, No. 2183, p. 417. 
Puget Sound to Socorro Island. 
PHOLADIDEA MELANURA Sowerby, 1834. 
Proc. Zool. Soc., p. 70 ; Thes. Conch. Pholas, pi. 107, figs. 78, 79. 
Redondo, California, 40 fathoms. c^^a^dL^r-r; 
