PELECYPODA. 71 



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

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



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

 vol. 13, p. 148. 



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

 Massachusetts. 



* Gemma gemmia purpurea (H. C. Lea). 



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

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



Cyrena purpurea H. C. Lea, Amer. Journ. Sci., 1842, ser. 1, vol. 

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



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



Mass. — Vineyard Sound. 

 R. I.— Buttonwoods. 

 Conn. — - Near New Haven. 



PETRICOLIDAE. 



*Petricola pholadiformis 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., 

 1855, vol. 2, pt. 2, p. 772, pi. 166, fig. 4. " South America." 



