SUMMARY OF SPECIES. 
CLASS PELECYPODA. 
Order PRIONODESMACEA. 
(FOLIOBRANCHIATA) 
Superfamily SOLENOMYACEA. 
Family SOLEMYACIDAE. 
Genus SOLEMYA Lamarck, 1818. 
Subgenus Achaeax Dali, 1908. 
4CHARAX JOHNSONI Dali, 1891. 
Proc. U. S. Nat. Mus., vol. 14, p. 189; vol. 17, p. 712, pi. 25, fig. 1. 
Oregon to Panama, ^ 
ACHARAX AGASSIZII Dali, 1908. 
Bull. Mus. Comp. Zool., vol. 43, p. 3G.5, pi. IG, fig. 10. 
Tillamook, Oregon, to Point Aguja, Peru. 
Subgenus Peteasma Dali, 1908. 
PETRASMA PANAMENSIS Dali, 1908. 
Bull. Mus. Comp. Zool., vol. 43, No. 6, p. 366. 
Santa Barbara, California, to Panama. 
PETRASMA VALVULUS Carpenter, 1864. 
Ann. Mag. Nat. Hist., ser. 3, vol. 13, p. 312. 
San Pedro, California, to Gulf of California. 
Superfamily NUCULACEA. 
Family NUCULIDAE. 
Genus NUCULA Lamarck, 1799. 
NUCULA TENUIS Montagu, 1808. 
Test. Brit. Suppl., p. 56, pi. 29, fig. 1. — Hanley, Mon. Nuculidae, [li. 4, 
figs. 140, 141. 
Point Barrow to Coronado Islands. Circumboreal. 
NUCULA TENUIS EXP ANSA Reeve, 1855. 
Last of the Arctic Voy., App., p. 397, pi. 33, fig. 2. 
Arctic Ocean to Sitka, Alaska: San Diego? 
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