578 A. FE. Verrill— Catalogue of Marine Mollusea. 
It occurs abundantly, as a fossil, in the Post-pliocene beds of Nan- 
tucket Island; also at Provineetown, Mass. In the Miocene of Vir- 
ginia and North Carolina. 
Modiola polita Verrill and Smith. 
Modiola polita Verrill and Smith, in Verrill, Amer. Journ. Sci., xx, pp. 392, 400, 
Nov., 1880; Verrill, Proc. U.S. Nat Mus., iii, p. 402, Jan., L881. 
Dall, Bulletin Mus. Comp. Zool., ix, p. 116, 1881. 
? Mytilus luteus Jeffreys, French Expl. in Bay of Biscay, in Rep. Brit. Assoc., 1880 
(no description); Ann. and Mag. Nat. Hist., Oct., 1880, p. 315 (no description). 
Mr. Dall has compared his specimens with our original types. 
Two living specimens were taken at station 895, in 238 fathoms. 
Gulf of Mexico, 339 fathoms, “ Blake” Exp. (t. Dall). Bay of Bis- 
cay,—Jeffreys. 
Mr. Dall thinks that JZ luteus is certainly identical with this 
species, judging from a recent description in Journ. de Conch., which 
I have not seen. Our description has priority of publication, 
If the genus Modiola is not to be considered valid, this species 
should be called mytilus politus. 
Crenella decussata (Montagu) Macgillivray, 1843. 
Modiola ? cicercula Moller, Kréyer’s Tidsskr., iv, p. 92, 1842. 
Crenella decussata Lovén, Ind. Moll. Scand. Occid., p. 32, 1846. 
Vey 
Jeffreys, Brit. Conch., ii, p. 133; v, pl. 28, fig. 6. 
Verrill, Amer. Journ. Sci., vol. vi, p. 440, 1873; vol. vii, pp. 409, 412, 1874. 
G. O. Sars, op. cit., p. 31, pl. 3, figs. 4, a, b, 1878. 
PLATE XLIV, FIGURE 7. 
This species has been taken in many localities, on muddy bottoms, 
by the U.S. Fish Com., on the northern coasts of New England. 
Grand Menan, 3 to 10 fathoms, 1872; Casco Bay, 10 to 20 fathoms, 
1873; off Martha’s Vineyard, stations 865-7, 871, 949, 950, in 64 to 
115 fathoms. 
Gulf of Mexico, “Blake” Exp. (t. Dall). Gulf of St. Lawrence! 
(coll. Whiteaves). Greenland; Iceland; Nova Zembla; Spitzbergen. 
From Finmark and Lapland to Great Britain and the Mediterranean. 
Northwest coast of America. Corea, 35 to 40 fathoms (t. Jeffreys). 
It occurs from low-water mark to 1750 fathoms. 
Fossil in the Pliocene and Post-pliocene of Europe. 
