676 EEPOET OF COMMISSIONER OF FISH AND FISHERIES. 



Blainv., 1S24:,— Madia Oken, 1835, and undoubtedly belongs to the 

 TellinidWj near Fsammobia, as shown by the structure of the soft parts. 

 (See page 373 and Plate xxvi, fig-. 181). 



Tagelijs divisus. Plate XXX, fig. 218. (p. 435.) 



Dall, op. cit., p. 251, 1870. Solcit divisus Spengler, op. cit., p. 96, 1794 (t. Gould). 

 Solen Mdeiis Chemnitz, op. cit., p. 203, Plate 198, fig. 1939, 1799. Sohn fra<jilis 

 Piilteney, Dorset Catal., p. 28, Plate 4, fig. .5, 1799 (t. Gould). Solen centralis 

 Say, Journ. Acad. Nat. Sci., Pbilad., a'oI. ii, p. 316, 1822. Solccurtus iidens 

 Forbes and Hanley, op. cit., vol. i, p. 266 ; Stimpsou, Shells of New England, 

 p. 22. Solcoirtus divisus Gould, Inv^ert., ed. ii, p. 44, fig. 368. Madia divisa 

 Gray, Catal. Brit. Moll., p. 160. Lcfjumiiiaria Floridana Conrad, Proc. Acad. 

 Nat. Sci., Philad., vol. iv, p. 121, 1848. Mesopleura hideulata Conrad, Catal. 

 Solenidic, Amer. Jour. Conch., vol. iii, Appendix, p. 23, 1867. 



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, (Cones). Tampa Bay, Florida, 

 (Conrad, Jewett). 



Macoma fragilis Adams. Plate XXX, fig. 222. 

 H. and A. Adams, Genera, vol. ii, p. 400, 1858. 



Var,fusca = Macomafusca Adams, (p. 359.) 



Genera, vol. ii, p. 400; Gould, Invert., ed. ii, p. 93, fig. 400. Psammohia fnsca 

 Say, Jour. Acad. Nat. Sci., Philad., vol. v, p. 220, 1826. Snnrjuinolaria 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 0. Fabricius, Fauna Grijulaudica, p. 413, 1780. Tellina Gronlan- 

 dica Beck, Lyell, in Trans. Geol. Soc, Loudon, vol. v, p. 137, Plate 16, fig. 8, 

 1841. Macoma Gronlandica Packard, Mem. Boston Soc, a^oI. i, pp. 235, 243, etc. 

 1866; Dawson, Notes on Post-Pliocene Geologj'- of Canada, p. 72, from Cana- 

 dian Naturalist, vol. vi, 1872. Tellina Fahricii Hanley; Sowerby, Thesaurus, j). 

 112, (t. Mcirch). 



Georgia to Greenland. Yar. fusca is abundant on the entire coast of I 

 Xew England, Long Island, and Xew Jersey. Georgia (Say, Couper). 

 Yar. fragilis ifi abundant from Long Island Sound and Massachusetts 

 Bay to Labrador. The two forms grade into one another insensibl}'. 



A closely related but apparenth^ distinct species, M. Balthica (LinneJ 

 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 ofj 

 America, but is regarded as distinct by Dr. P. P. Carpenter and others. 



As a fo.ssil, var. fragilis is abundant in the Post-Pliocene deposits ofl 

 Xew England, New Brunswick,. Canada, Labrador, and Greenland; var.\ 

 fusca occurs in the Post-Pliocene of Xew England, Virginia, North Caro-j 

 lina, and South Carolina. 



