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gs A. E. Verrill— Catalogue of Marine Mollusca. 573 
Yoldia frigida Torell. 
Yoldia frigida Torell, Spitz. Moll., p. 148, pl. 1, fig. 3, 1859. 
G. O. Sars, Moll. Reg. Arct. Norv., p. 39, pl. 4, figs. 11, a, 6. 
Verrill, Amer. Journ. Sci., xx, p. 392, Nov., 1880; Proc. U. S. Nat. Mus., iii, p. 
401, 1881. 
PLATE XLIV, FIGURE 2. 
Gulf of Maine, 1873, and Jeffrey’s Ledge, off the coast of Maine, 
in 88 to 92 fathoms, “ Bache” 1874. Off Cape Cod, 106 fathoms, 
1879. Off Martha’s Vineyard, stations S80, 894, 943, 947, 997-999, 
in 153 to 365 fathoms. Gulf of St. Lawrence, 200 fathoms! (coll. 
W hiteaves). 
Spitzbergen. Nova Zembla. Lofoten I. to the Mediterranean. 
Northern Japan (t. Jeffreys). 
Arca ponderosa Say. 
Arca ponderosa Say, Journ. Acad. Nat. Sci. Phil., ii, p. 267, 1822. 
Verrill, Rep. Invert. Anim. Vineyard Sd., in Rep. U. 8. Fish Com., i, p. 692 
(auth. cop., p. 398), 1874. ; 
Frequently found on the beach at Edgartown, Martha’s Vineyard, 
and on the south side of Long Island, but it has not been found living 
north of Cape Hatteras. The beach shells may be from a submerged 
fossiliferous deposit, or it may possibly live in favorable localities, off 
shore. 
Arca pectunculoides Scacchi, 1833. 
Jeffreys, Brit. Conch., ii, p. L7L; v, p. 175, pl. 30, fig. 3. 
Verrill, Amer. Journ. Sci., v. p. 14, 1873. 
G. O. Sars, op. cit., p. 43. 
Arca grenophia Risso, 1826 (t. Jeffreys). 
Arca glacialis Verrill, Proc. U. S. Nat. Mus., iii, p. 401, 1881 (? non Gray). 
Variety, grandis Leche. 
(Efversigt Svenska Exp. Novaja Semlja och Jenissej, 1875, 1876, Hafs—Mollusker, 
im K. Sv. Vet.-Akad. Handl, xvi, 2 [p. 30], pl. 1, figs. 9, a—c, 1878. 
Variety, Septentrionalis (G. 0. Sars) Jeffreys. 
Arca septentrionalis G, O. Sars, op. cit., p. 43, pl. 4, figs. 2, a-c. 
