PELECYPODA. 15 



Yoldia cascoensis (Mighels tind Adams). 



Nucula cascoensis Mighels and Adams, Boston Joum. Nat. Hist., 

 1842, vol. 4, p. 40, pi. 4, fig. 6. " Casco Bay." 



Me. — Casco Bay, from stomach of haddock. 



* Yoldia (Portlandia) thraciaeformis (Storer). 



Nucula thraciaeformis Storer, Boston Journ. Nat. Hist., 1838, 



vol. 2, p. 122, fig. " FROM THE STOMACH OF A PlATESSA * * * 

 CAUGHT OFF PrOVINCETOWN, CaPE CoD." 



Yoldia thraciaeformis Gould, Inv. Mass., 1870, p. 157, fig. 465. 

 Megayoldia thraciaeformis Verrill and Bush, Ainer. Journ. Sci., 

 1897, ser. 4, vol. 3, p. 55, fig. 17. 



Me. — Casco Bay^l5 fathoms; Frenchman's Bay, 10 to 28 fath- 

 oms; Eastport, 10 fathoms. 



Mass. — Off Cape Cod, in about 30 fathoms. 



Yoldia (Microyoldia) regularis (Verrill). 



Yoldia regularis Verrill, Trans. Conn. Acad., 1884, vol. 6, p. 228. 

 " OFF Martha's Vineyard, in 349 fathoms." 



Microyoldia regularis Verrill and Bush, iVmer. Journ. Sci., 1897, 

 ser. 4, vol. 3, p. 56, figs. 5, 6. 



Mass.— OfP Thatcher's Island, 98 fathoms. 



* Yoldia (Yoldiella) lucida (Loven). 



Yoldia lucida Loven, Ofvers. Kongl. Vet.-Akad. Forh., 1846, vol. 

 3, p. 188. " Boh[us] — Finm[ark]." 



Yoldia obesa Gould, Inv. Mass., 1870, p. 155, fig. 463. 



Yoldiella lucida Verrill and Bush, Proc. U. S. Nat. Mus., 1898, 

 vol. 20, p. 861, pi. 77, fig. 2; pi. 80, fig. 3. 



Me. — Casco Bay and off Cape Elizabeth, 30 to 95 fathoms. 

 Mass. — Massachusetts Bay; near the Georges Bank, 110 to 150 

 fathoms. 



R. I. — East of Block Island, 29 fathoms.. 



