SUMMARY OF SrECIES. 



CLASS PELECYPODA. 

 Order PRIONODESMACEA. 



(FOLIOBRANCHIATA) 

 Superfamily SOLENOMYACEA. 



Family SOLEMYACIDAE. 



* 



Genus SOLEMYA Lamarck, 1818. 

 Subgenus Achabax Dall, 1908. 



ACHARAX JOHNSONI Dall, 1891. 



Proc. U. S. Nat. IVJus., vol. 14, p. 189 ; vol. 17, p. 712, pi. 25, fi? 

 Oregon to Panama. 



ACHARAX AGAS3IZII Dall, 1908. 



Bull. Mus. Coinp. Zool., vol. 43, p. 365, pi. 10, fig. 10. 

 Tillamook, Oregon, to Point Aguja, Peru. 



Subgenus Petrasma Dall, 1908. 



PETRASMA PANAMENSIS Dall, 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, pi. 4, 



figs. 140; 111. 

 Point Barrow to Coronado Islands. Circumboreal. 



NUCULA TENUIS EXPANSA Reeve, 1855. 



Last of the Arctic Voy., App., p. 397, pi. 33, fig. 2. 

 Arctic Ocean to Sitka, Alaska: San Diego? 



