378 REPORT OF COMMISSIONER OF FISIL AND FISHERIES. L672] 
fathoms or more. In Casco Bay it is extremely abundant in rocky, cay- 
ernous pools, among the ledges at low-water mark, and mostly attached 
by a byssus, associated with Modiola modiolus. 1 also found specimens 
in 10 to 15 fathoms, perforating recent and sound shells of Oyprina 
Islandica. In the Gulf of Saint Lawrence, near Anticosti Island, where 
limestone abounds, I have found it burrowing in the limestone in Jarge 
numbers. South of Cape Cod it is far less abundant, though not un- 
common in Long Island Sound. Var. distorta (Say) is common from 
Fort Macon to Georgia, and is possibly a distinet species. Joxssil in the 
Post-Pliocene of Maine, New Brunswick, Canada, Anticosti, Labrador, 
Scandinavia, and Great Britain; in the Coralline and Red Crags of Ing. 
land, etc. Var. distorta is found in the Miocene of Maryland. 
MYA ARENARIA Linné, Plate XXVI, fig. 179. (pp. 357, 4163.) 
Systema Natumer, ed. xii, p. 1112, 1767; Gould, Invert., ed. i, pp. 40, 3505 ed. fi, p. 
55, fig. 375. Mya mercenaria and M, acuta Say, Journal Acad. Nat. Sci., Phila 
delphia, vol. ti, p. 313, 1822. 
South Carolina to the Arctic Ocean; northern coasts of Murope, south 
to England and France; northeastern coast of Asia, south to China and 
Japan (Hakodadi). Sitka (Middendorff). South Carolina (Gibbs). lort 
Macon, North Carolina (Dr. Yarrow). Comparatively scarce south of 
Cape Hatteras. Very abundant from New Jersey northward, both in 
brackish estuaries and on the open coasts. Particularly large and fine in 
Long Island Sound (sce p. 463). Casco Bay and Bay of Fundy, from 
half-tide mark to 40 fathoms, those dredged Deing all young. Jossil in 
the Post-Pliocene of Scandinavia, Greenland, Labrador, Canada, New 
England, Virginia, South Carolina, cte.; in the Red-Crag and all later 
formations in Great Britain ; and in the Miocene of Virginia. 
CORBULA CONTRACTA Say. Plate XXVIF, fig, 191. (p. 418.) 
Journal Acad. Nat. Sciences, Philadelphia, vol. ii, p. 312, 1422; Gould, Invert., 
ed. i, p. 43, lig. 875 cd. ii, p. 60, fig. 377. 
Cape Cod to Florida. Common, living, in Vineyard Sound and Buz- 
zard’s Bay, in 5 to 19 fathoms; Long Island Sound, near New Jfaven, 
not uncommon in shallow water. Georgia (Couper).  Tossil in the 
Post-Vliocene of Virginia, North’and South Carolina ; and in the Plio- 
cene of South Carolina. <A closely related species occurs in the Mio- 
cene of Maryland. 
LYONSIA HYALINA Conrad. Plate XXVIII, fig. 194. (j. 55%.) 
American Marine Conchology, p.o1, Plate 11, fig. 2, 1431; Gould, Invert., ed. ii, p- 
64, fig. 340. Mya hyalina Conrad, Jour. Acad. Nat. Sci., Philadelphia, vol. vi, 
p. 261, late JA, fig. 12, 1831. Onteodexnma hyalina Couthouy, Boston Jour. Nat. 
Hist., vol. ti, p. 166, 1-39; Gould, Invert, ed. i, p. 46, fig. 31. 
Florida to Gulf of Saint Lawrence, Common in Long Ssland Sound, 
Buzzard’s Vay, Vineyard Sound, Massachusetts Bay, Casco Bay, and 
Bay of Fundy ; low-water mark to 30 fathoms; Beaufort, North Carolina 
(Coues), 
