386 REPORT OF COMMISSIONER OF FISH AND FISHERIES. [680] 
MACTRA SOLIDISSIMA Chemnitz. Plate XXVIII, fig. 202. (p. 358.) 
Conch., x, p. 350, Plate 170, fig. 1656, 1788; Gould, Invert., ed. i, p.515 ed. ii, p. 
73, fig. 387 Blanc gigantea Lam., Anim. sans Vert., ed. ii, vol. vi, p. 07. Mac- 
tra similis om Journ. Acad. Nat. Sci., Philadelphia, Sai ii, p. 309, 1922; Binney’s 
Say, p. 101. Spisula solidissina Gray, Charlesworth’s Mag. Nat. Hist., vol. i, 
RaQ 
p. 373, 1887; H. and A. Adams, vol. xi, p. 378. ' Hemimactra solidissima Conrad, 
Amer. Journ. Conch., vol. ili, appendix, p. 32; Perkins, Proc. Bost. Soc. Nat. 
Hist., vol. xiii, p.346,1869. Spisula Sayi Gray, op. cit., p. 373. 
Florida and Gulf of Mexico to Labrador. Very abundant on the 
outer beach at Great Egg Harbor, New Jersey; Long Island; Long 
Island Sound; Vineyard ‘Sound: Cape Cod; Massachusetts are Casco 
Bay; Bay of Pica low water- peg to 10 fathoms,sandy. Fort Macon, 
North Carolina (Cones); Labrador (Packard) ; St. George’s Bank (S. 
I. Smith) ; West Florida (Jewett); Texas (Roemer). 
Fossil in the Post-Pliocene at Point Shirley, Chelsea, Massachusetts 
(Stimpson); andapparently in the Miocene of North and South Carolina 
(Conrad, as ‘ AL. similis ?”). 
MULINIA LATERALIS Gray. Plate X XVI, fig. 185, B. (p. 373.) 
Charlesworth’s Mag. of Nat. Hist., vol. i, p. 376, 1837; Meek, Smithsonian Check- 
Lists, Miocene, p. 11,1864. Mactra lateralis Say, Journ. Acad. Nat. Sci., Philad., 
vol. ii, p. 309, 1822; Gould, Invert., ed. i, p. 54, figs. 34, 35; ed. ii, p. 77, fig. 
389. Standella lateralis H. and A. Adams, Genera, vol. ii, p. 382, 1858; Conrad, 
Proc. Philad. Acad., vol. xiv, p. 573, 1862. 
Massachusetts Bay to Florida, and on the northern shores of the 
Gulf of Mexico to Galveston, Texas. Very abundant in Long Island 
Sound; common in Buzzard’s BAY and Vineyard Sound, 1 to 15 fath- 
oms, mud. Boston and near Lynn, Massachusetts (Gould). Fort Macon, 
North Carolina (Coues). Georgia (Couper). Texas (Roemer). 
Fossil in the Post-Pliocene of Virginia, North Carolina, South Carolina; 
and Florida (Saint John’s River) ; in the Pliocene of South Carolina; and 
in the Miocene of Virginia, North and South Carolina. 
PETRICOLA PHOLADIFORMIS Lamarck. Plate X XVII, fig. 199. (p. 
372.) 
Anim. sans Vert., ed. i, vol. v., p. 505, 1818; ed. ii, vol. vi, p. 159; Say, Amer. 
Conch., Part vi, Plate 60, fig. 1, 1834; Binney’s Say, p. 222 (same plate Han- 
ley, Recent Shells, p. 52, Plate 13, fig. 49; Gould, Invert., ed. i, p.63; ed. ii, p, 
90, figs. 398, 399. Petricola fornicata Say, Journ. Acad. Nat. Sci., Philadelphia, 
vol. ii, p. 319, 1822. Peltricola dactylus Say, Amer. Conch., Part vi, Plate 60, 
fig. 2 (non Sowerby, Hanley, ete.); Gould, Invert., ed. i, p. 65; ed. ii, p. 92, 
fio. 41. 
Florida and Gulf of Mexico to Massachusetts Bay; local and more 
rare farther north, at Quahog Bay, Maine; and in the southern part of 
the Gulf of Saint Lawrence, as at Prince Edward’s Island (Dawson) ; 
Nova Scotia (Willis). Very common in Long Island Sound, near New 
Haven; Buzzard’s Bay; Vineyard Sound (Lackey’s Bay, ete.); and 
Massachusetts Bay (Chelsea, Nahant, ete.). Fort Macon (Coues) ; 
