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TERTIARY FAUNA OF FLORIDA '^ ' 



Oregon, but should be carefully compared with the recent types before these 

 identifications are accepted, since in many cases the fossils prove to be repre- 

 sentative and not identical. Conrad described (without a figure) a Tellina 

 nasuta from Oregon in the " Geology of the Wilkes Exploring Expedition" 

 in 1849, apparently quite forgetting a recent species, to which he gave the 

 same name, from Nuttall's Californian collection in 1837. The Pliocene 

 species are better preserved and identified, and here M. iiiquiiiata Deshayes 

 and Ad. nasuta Conrad, 1837, have been recognized. The Pleistocene has 

 yielded M. calcarea Gmelin, M. nasuta Conrad, 1837, M. inquinata Deshaves, 

 M. balthica Linne (-|- calif ornica Conrad and inconspicua Brod. and Sby.), 

 and M. yoldiformis Carpenter, all known in the recent state from the Pacific 

 coast. 



From the Atlantic coast Pleistocene the number of names is even larger, 

 including all or nearly all of the recent species, which I will not enumerate 

 here, as nearly all of them have been referred to already in this work. 



Macoma ( Rexithaerus ) secta Conrad. 

 Tellina secta Conrad, Journ, Acad. Nat. Sci. Phila., vii., p. 257, 1837 ; Hanley, Thes- 



Conch., p. 327, pi. 6s, figs. 245, 248, 1847. 

 Tellina ligamentina Deshayes, Mag. de Zool., 1843, pi. 8. 

 Macoma secta H. and A. Adams, Gen. Rec. Moll., ii., p. 401, 1858. 

 Macoma van edulis (Nutt. MS.) Carpenter, Rep. Brit. Assoc, for 1863, p. 639. 

 Macoma (Rexithcerus) secta Tryon, Cat. Tellinidje, p. 104. 1869. 



Pleistocene of San Diego, California, Stearns ; recent from Puget Sound 

 to Lower California. 



To the same group belongs Macoma indentata Cpr., which also occurs in 

 the Pleistocene of San Diego, and recent in the adjacent region. 



Macoma (Psammacoma) tracta n. sp. 

 Plate 47, Figure 13. 



Oligocene of the Chipola horizon on Shoal River, Walton County, Florida, 

 and of the Bowden'beds, Jamaica. 



Shell small, thin, rather compressed, elongated, inequilateral, the anterior 

 end longer ; beaks low, not conspicuous ; posterior end slightly flexed to the 

 right ; anterior end higher, rounded, posterior attenuated, bluntly terminated ; 

 surface smooth except for faint incremental lines ; interior ( inaccessible in 

 the specimens). Lon. 12.7, alt. 5, diam. 2 mm. 



This small species differs from the young of the next in its more attenu- 

 ated posterior end and slight flexure. 



