386 REPORT OF COMMISSIONER OF FISIL AND FISHERIES. [680] 
MAOTRA SOLIDISSIMA Chemnitz. Plate XX VU, fig. 202. (p. 358.) 
Conch., x, p. 350, Plate $7), fig. 1656, 17445 Gonld, Invert., ed. i, p.51; ed. il, p. 
73, fig. 387. Mactra gigantea Lam.,, Anim. sans Vert, ed. ii, vol. vi, p. 97. Mac- 
tra similis Say, Journ. Acad, Nat. Sci., Philadelphia, vol. ii, p. 309, 1422; Binney’s 
Say, p. 101. Spiaula solidissima Gray, Charlesworth’s Mag, Nat. Hist., vol. i, 
p. 373, 1437; If, and A. Adams, vol. xi, p. 874. emimactra solidissima Conrad, 
Amer, Journ. Conch., vol. iii, appendix, p. 82; Perkins, Proc. Bost. Soc, Nat, 
Hist., vol. xiii, p. 346, 1869, Spiaula Sayi Gray, op. cit., pp. 373. 
Florida and Gulf of Mexico to Labrador. Very abundant on the 
outer beach at Great gg Harbor, New Jersey; Long Island; Long 
Island Sound; Vineyard Sound ; Cape Cod; Massachusetts Bay ; Casco 
Bay; Bay of Fundy, low water-mark to 10 fathoms, sandy. ort Macon, 
North Carolina (Coues); Labrador (Packard); St. George’s Bank (8. 
I. Smith) ; West Florida (Jewett); Texas (Roemer). 
Fossil inthe Post-Pliocene at Point Shirley, Chelsea, Massachusetts 
(Stimpson); and apparently in the Miocene of North and South Carolina 
(Conrad, as “ AW. similis ?”). 
MULINIA LATERALIS Gray. Plate XXVJ, fig. 185, B.  (p. 373.) 
Charlesworth’s Mag. of Nat. Hist., vol. i, p. 376, 1437; Meck, Smithsonian Check- 
Lists, Miocene, p.11, 1464. Mactra lateralis Say, Journ. Acad, Nat. Sci., Philad,, 
vol. ii, p. 309, 1422; Gould, Invert., ed. i, p. 54, figs. 44, 35; ed. ii, p. 77, fig. 
3A9. . Slandella lateralis HW. and A. Adams, Genera, vol. ii, p. 342, 1454; 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). Tort Macon, 
North Carolina (Coues). Georgia (Couper). Texas (cemez). 
Fossil in the Post-Pliocene of Virginia, North Carolina, South Carolinas 
and Florida (Saint John’s River) ; iu the Pliocene of South Carolina; and 
in the Miocene of Virginia, North and South Carolina. 
PEYRICOLA PHOLADIFORMIS Lamarck, Plate XXVII, fig. 199. (p. 
372.) 
Anim, sans Vert., ed. i, vol. v., p. 505, 1814; ed. ii, vol. vi, p. 150; Say, Amer. 
Conch., art vi, Plate €0, fig. 1, 1431; Binney’s Say, p. 222 (same plate); Han- 
ley, Recent Shells, p. 52, Plate 13, fig. 49; Gould, Invert., ed. i, p.635 ed. ii, p, 
90, figs. 394, 399. W’etricola fornicata Say, Journ. Acad. Nat. Sci., Philadelphia, 
vol. ii, p. 319, 1422. Metricola dactylus Say, Amer. Conch., Part vi, Plate 60, 
fig. 2 (vow Sowerby, Hanley, cte.); Gould, Invert., ed. i, p. 655 ed. ii, p. 92, 
fig. 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 dward’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 Day (Chelsea, Nahant, ete.). Sort Macon (Coues); 
