PELECYPODA. 71 



Gemma tottenii Stimpson, Smithson. Misc. Coll., 1860, vol. 2, 

 art. 6, no. 3, p. 3. 



Totteniana gemma Perkins, Proc. Boston Soc. Nat. Hist., 1869, 

 vol. 13, p. 148. 



Me. to Conn. — Especially abundant on the sandy shores of 

 Massachusetts. 



*Geinma gemma purpurea (H. C. Lea). 



Dall, Trans. Wagner Free Inst. Sci., 1903, vol. 3, pt. 6, p. 1332, 

 pi. 24, figs. 2, 4, 4b. 



Cyrena piirjmrea H. C. Lea, Anier. Journ. Sci., 1842, ser. 1, vol. 

 42, p. 106, pi. 1, fig. 1. " Delaavare Bay." 



Gemvia manhattensis Gould, Inv. Mass., 1870, p. 138, fig. 449. 



Mass. — Vineyard Sound. 

 R. L^ — Buttonwoods. 

 Conn. — Near New Haven. 



PETRICOLIDAE. 



*Petricola pholadif ormis Lamarck. 



Lamarck, Hist. Nat. Anim. sans Vert., 1818, vol. 5, p. 505. 

 Gould, Inv. Mass., 1870, p. 90, fig. 398. 



Petricola fornicata Say, Journ. Acad. Nat. Sci. Phila., 1822, 

 ser. 1, vol. 2, p. 319. " coast of North America." 



Me. — Quahog Bay, in Casco Bay; Old Orchard Beach. 

 Mass. — Salem; Revere; Cohasset; Vineyard Sound and Buz- 

 zards Bay. 

 R. I. — Narragansett Bay. 

 Conn. — Near New Haven. 



*Petricola dactylus Sowerby. 



Sowerby, Genera Shells, 1820-1825, pi. 53, fig. 3; Thes. Conch., 

 185.5, vol. 2, pt. 2, p. 772, pi. 166, fig. 4. " South America." 



