[673] INVERTEBRATE ANIMALS OF VINEYARD SOUND, ETC. 379 
CLIDIOPHORA TRILINEATA Carpenter. Plate XX VII, fig. 193. (p. 418.) 
Proc. Zo6l. Soe., London, 1264, p. 597; Mollusks of W. N. America, p. 226. Pan- 
dora trilineata Say, Journ. Acad. Nat. Sciences, Philadelphia, vol. ii, p. 261, 
1422; Gould, Invert., ed. i, p. 44; ed. ii, p. 62, fig. 379. 
Florida tu Gulf of 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; Great Egg 
Harbor, New Jersey, 1 fathom. Beaufort, North Carolina (Coues, Yar- 
row). Fossilin 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 X XVII, fig. 197. (p. 509.) 
Amer. Journal Science, vol. iii, pp. 213, 285, Plate 7, figs. 1, 19, 1» (animal and 
hinge), 1-72. 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 Iundy, 10 to 100 fath- 
oms. Less frequent south of Cape Cod; off Block Island, in 29 fathoms, 
(A. 8. 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 XXVIT, fig. 196), but 
they are easily distinguished by the structure of the hinge. The latter 
occurs in Massachusetts Bay, Bay of Fundy, etc., northward to Green- 
land, but has not been recorded from south of Cape Cod. 
CocuLODESMA LEANUMConthouy. Plate X XVI, fig. 198. (p. 418.) 
Boston Jour. Nat. Hist., vol. ii, p. 170, 1539; Stimpson, Shells of New England, 
p. 22; Gould, Invert., ed. i, p. 49, figs. 29, 30; ed. ii, p. 68, fig. 343. ulnatina 
Leana Conrad, Jour. Acad. Nut. 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.) 
Boston 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 declirvis 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 Vv 
