676 REPORT OF COMMISSIONER OF FISH AND FISHERIES. 



Blainv., lS2±,=A[acha Oken, 1835, and undoubtedly belongs to the 

 Tellinidw, near Psammobia, as shown by the structure of the soft parts. 

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



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



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

 Solen Mdens Chenmitz, op. cit., p. 203, Plate 198, fig. 1939, 1799. Solen fragilis 

 Pulteney, Dorset Catal., p. 28, Plate 4, fig. 5, 179S (t. Gould). Solen centralis 

 Say, Jouru. Acad. Nat. .Sci., Pbilad., vol. ii, p. 316, 1822. Solecurtus Mdens 

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

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

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

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

 Solenidas, 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. Bhode Island, rather common, (Gould). 

 Fort Macon, Xorth Carolina, common, (Cones). Tampa Bay, Florida, 

 (Conrad, Jewett). 



Macoma fragilis Adams. Plate XXX, fig. 222. 

 H. and A. Adarn,s, 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, Jonr. Acad. Nat. Sci., Philad., vol. v, p. 220, 1826. Sang uinolaria 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 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. 

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

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

 112, (t. Morch). 



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

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

 Yar. 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 

 J New England, ISTew Brunswick, Canada, Labrador, and Greenland; var. 

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

 lina, and South Carolina. 



