[673] INVERTEBRATE ANIMALS OF VINEYARD SOUND, ETC. 379 
CLIDIOPHORA TRILINEATA Carpenter. Plate XX VIT, fig. 195. (p. 418.) 
Proc. Zool, Soe., London, 1864, p. 597; Mollusks of W. N. America, p. 226. Pan- 
dora trilineata Say, Journ, Acad, Nat. Sciences, Philadelphia, vol. ii, p. 261, 
1822; Gould, Invert., ed. i, p. 44; ed. ii, p. 62, fig. 379. 
Florida to Gulf 6 Saint Lawrence. Common in Long Island Sound ; 
off Block Island, 29 fathoms ; Buzzard’s Bay; Vineyard Sound; Casco 
Bay; and Bay of Fundy; low water mark to 30 fathoms; Grant Egg 
Harbor, New Jersey, 1 fathom. Beaufort, North Carolina (Coues, Yar- 
row). Fossil in the Post-Pliocene of Virginia and South Carolina; and in 
the Pliocene of South Carolina. <A closely-related form, C. crassidens 
(Conrad, sp.), occurs in the Miocene of Virginia. 
PERIPLOMA PAPYRACEA Verrill. Plate XXVII, fig. 197. (p. 509.) 
Amer. Journal Science, vol. iii, pp. 213, 285, Plate 7, figs. 1, 1", 1" (animal and 
hinge), 1872. Anatina papyratia Say, op. cit., p. 514, 1822. Anatina papyracea 
Gould, Invert.,ed. i, p. 47, fig. 28; ed. ii, p. 66, fig. 382. <Anatina fragilis 
Totten (name provisional), Amer. Jour. Science, vol. xxviii, p. 347, fig. 1, 1835 
New Jersey to Labrador. Anticosti Island (A. E. V.) ; not uncommon 
in Massachusetts Bay, Casco Bay, and Bay of Fundy, 10 to 100 fath- 
oms. Less frequent south of Cape Cod; off Block Island, in 29 fathoms, 
(A. S. Packard); Newport, Rhode Island (Totten); Greenport, Long 
Island (S. Smith). Chateau Bay, Labrador (Packard). 
This species, when. young, is liable to be confounded with Thracia 
myopsis Beck = T. Couthouyi Stimpson (see Plate XX VII, fig. 196), but 
they are easily distinguished by the structure of the hinge. The latter 
oceurs in Massachusetts Bay, Bay of Fundy, ete., northward to Green- 
land, but has not been recorded from south of Cape Cod. 
COCHLODESMA LEANUMCouthouy. Plate X XVII, fig. 198. (p. 418.) 
Boston Jour. Nat. Hist., vol. ii, p. 170, 1839; Stimpson, Shells of New England, 
p. 22; Gould, Invert., ed. i, p. 49, figs. 29, 30; ed. ii, p. 68, fig. 383. Anatina 
Leana Conrad, Jour. Acad. Nat. Sciences, vol. vi, p. 263, Plate 11, fig. 11, 1831. 
North Carolina to the Gulf of Saint Lawrence. Vineyard Sound and 
Long Island Sound, not uncommon in 3 to 10 fathoms; Casco Bay and 
Eastport, Maine, rarely obtained alive; banks off Nova Scotia (Willis) 5 
Saint George’s Bank (S. I. Smith and O. Harger). A related species, 
C. antiquatum (Periploma antiquata Conrad), occurs in the Miocene of 
Virginia. 
THRACIA CONRADI Couthouy. (p. 426.) 
3oston Jour. Nat. Hist., vol. ii, p. 153, Plate 4, fig. 2, 1839; Gould, Invert., 
ed. i, p. 50; ed. ii, p. 69, fig. 384. Thracia declivis Conrad, Amer. Mar. Conch., 
p. 44, Plate 9, fig. 2, 1831 (not of Pennant). — 
Long Island to Gulf of Saint Lawrence. Vineyard Sound, 6 to 8 fath- 
oms; Casco Bay, 6 to 15 fathoms; Frenchman’s Bay, near Mount Des- 
ert, Maine, 3 to 8 fathoms. Eastport, Maine, in 6 fathoms, and Grand 
Menan (Stimpson) ; Nahant, Massachusetts (Haskell); Rhode Island 
26 V 
