382 KEPORT OF COMMISSIONER OF FISH AND FISHERIES. [676] 



Blainv,, 1824,=J/cAa Oken, 1835, and undoubtedly belongs to the 

 Tellinidce, near Psammobia, 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. Solen divisus Spengler, op. cit., p. 96, 1794 (t. Gould). 

 Solen lideits Chemnitz, op. cit., p. 203, Plate 198, fig. 1939, 1799. Solen fragilis 

 Pulteney, Dorset Catal., p. 28, Plate 4, fig. 5, 1.799 (t. Gould). Solen centralis 

 Say, Journ. Acad. Nat. Sci., Pbilad., vol. ii, p. 316, 1822. Solccurtus Widens 

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

 p. 22. Solecurtus divisus Gould, Invert., ed. ii, p. 44, fig. 368. Macha divisa 

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

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

 Solenidai, 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. Ehode 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 == Hacoma fusca Adams, (p. 359.) 



Genera, vol. ii, p. 400 ; Gould, Invert., ed. ii, p. 93, fig. 400. Psammobia fus.ca 

 Say, Jour. Acad. Nat. Sci., Philad., vol. v, p. 220, 1826. Sangiiinolaria 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. Fahricius, Fauna Groulandica, p. 413, 1780. Tellina Gronlan- 

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

 1841. Macoma Gronlandica Packard, Mem. Boston Soc., vol. i, pp. 235, 243, etc.j 

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

 dian Naturalist, vol. vi, 1872. Tellina Fcibricii Hanley; Sowerby, Thesaurus, p- 

 112, (t.Morch). 



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, M. Balthica (Linne, 

 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 distinct by Dr. P. P. Carpenter and others. 



As a fossil, var. fragilis is abundant in the Post-Pliocene deposits of 

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

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

 lina, and South Carolina. 



