382 REPORT OF COMMISSIONER OF FISH AND FISHERIES. [676] 
Blainy., 1824,— Macha Oken, 1835, and undoubtedly belongs to the 
Tellinide, near Psammobia, as shown by the structure of the soft parts. 
(See page 373 and Plate xxvi, fig. 181). 
TAGELUS DIVISUS. Plate XXX, fig. 218. (p. 435.) 
Dall, op. cit., p. 251, 1870.  Solen divisus Spengler, op. cit., p. 96, 1794 (t. Gould), 
Solen bidens Chemnitz, op. cit., p. 203, Plate 198, fig. 1939, 1799. Solen fragilis 
Pulteney, Dorset Catal., p. 28, Plate 4, fig. 5, 1799 (t. Gould). Solen centralis 
Say, Journ. Acad. Nat. Sci., Philad., vol. ii, p. 316, 1822. Solecurtus bidens 
Forbes and Hanley, op. cit., vol. i, p. 266; Stimpson, Shells of New England, 
p. 22. Solecurtus divisus Gould, Invert., ed. il, p. 44, fig. 368. Macha divisa 
Gray, Catal. Brit. Moll., p. 160. Leguminaria Iloridana Conrad, Proc, Acad. 
Nat. Sci., Philad., vol. iv, p. 121, 1848. Mesopleura bidentata Conrad, Catal. 
Solenidxe, Amer. Jour. Conch., vol. iii, Appendix, p. 23, 1807. 
Gulf of Mexico and West Indies to Cape Cod. Vineyard Sound and 
Buzzard’s Bay, not common. Rhode Island, rather common, (Gould). 
Fort Macon, North Carolina, common, (Coues). Tampa Bay, Florida, 
(Conrad, Jewett). 
MACOMA FRAGILIS Adams. Plate XXX, fig. 222. 
H. and A. Adams, Genera, vol. ii, p. 400, 1858. 
Var. fusca = Macoma fusca Adams. (p. 359.) 
Genera, vol. ii, p. 400; Gould, Invert., ed. ii, p. 93, fig. 400. Psammobia fusca 
Say, Jour. Acad. Nat. Sci., Philad., vol. v, p. 220, 1826. Sanguinolaria fusca Con- 
rad, Amer. Mar. Conch., p. 34, Plate 7, fig. 1, 1831; Gould, Invert., ed. i, p. 66, 
fig. 42. 
Var. fragilis. 
Venus fragilis O. Fabricius, Fauna Gronlandica, p. 415, 1780. Tellina Gronlan- 
dica Beck, Lyell, in Trans. Geol. Soc., London, vol. y, p. 137, Plate 16, fig. 8, 
1841. Macoma Gronlandica Packard, Mem. Boston Soc., vol. i, pp. 235, 243, ete., 
1866; Dawson, Notes on Post-Pliocene Geology of Canada, p. 72, from Cana- 
dian Naturalist, vol. vi, 1872. Tellina Fabriciti Hanley; Sowerby, Thesaurus, p- 
112, (t. Mirch), 
Georgia to Greenland. Var. fusca is abundant on the entire coast of 
New England, Long Island, and New Jersey. Georgia (Say, Couper). 
Var. fragilis is abundant from Long Island Sound and Massachusetts 
Bay to Labrador. The two forms grade into one another insensibly. 
A closely related but apparently distinct species, J. Balthica (Linné, 
sp.), is abundant in the Baltic and elsewhere on the northern coasts of 
Europe, and has been regarded as identical by several writers. Another 
similar form, inconspicua (Sowerby), occurs on the northwest coast of 
America, but is regarded as distinet by Dr. P. P. Carpenter and others, 
As a fossil, var. fragilis is abundant inthe Post-Pliocene deposits of 
New England, New Brunswick, Canada, Labrador, and Greenland; var. 
Susea occurs in the Post-Pliocene of New England, Virginia, North Caro- 
lina, and South Carolina. 
