PELECYPODA. 29 



Peden tryoni Dall, Bull. Mus. Comp. Zool., 1889, vol. 18, p. 438, 

 Chlamys (Aequipeden) glypta Verrill, Trans. Conn. Acad., 1897. 

 vol. 10, p. 76, pi. 16, figs. 7-11. 



Mass.— Off Marthas Vineyard, 85 to 120 fathoms. 



*Pecten (Plagioctenium) gibbus borealis Say. 



Ostrea gibba Linne, Syst. Nat., ed. 10, 1758, vol. 1, p. 698. 



Peden borealis Say, Journ. Acad. Nat. Sci. Phila., 1822, ser. 1, 

 vol. 2, p. 260. " New England." 



Peden irradians Gould, Inv. Mass., 1870, p. 199, fig. 496 {non 

 Lamarck). 



Peden gibbus var. borealis Dall, Trans. Wagner Free Inst. Sci., 

 1898, vol. 3, pt. 4, p. 747. 



Mass. to Conn. — The common scallop of southern New Eng- 

 land. 



*Pecten (Placopecten) magellanicus (Gmelin). 



Dall, Trans. Wagner Free Inst. Sci., 1898, vol. 3, pt. 4, p. 726. 



Ostrea magellanica Gmelin, Syst. Nat., 1790, vol. 1, pt. 6, p. 3317. 

 " Freto Magellanico." 



Peden tenuicostatus Mighels and Adams, Boston Journ. Nat. 

 Hist., 1842, vol. 4, p. 41, pi. 4, fig. 7. Gould, Inv. Mass., 1870, p. 

 196, fig. 494. 



Peden fuscus Linsley, Amer. Journ. Sci., 1845, ser. 1, vol. 48, 

 p. 278. 



Peden dintonius Verrill, Trans. Conn. Acad., 1884, vol. 6, p. 261 

 {non Say). 



Me. — Casco Bay, 4 to 10 fathoms; Frenchman's Bay, 3 to 10 

 fathoms; Eastport. 



Mass. — Massachusetts Bay; Duxbury; Vineyard Sound* 

 Georges Bank, 45 fathoms. 



R. I.— Off Watch Hill; off Block Island; Point Judith. 



Conn. — Stonington from codfish. 



