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817 



TERTIARY FAUNA OF FLORIDA 



Pleistocene of South Carolina, Holmes; recent at New Bedford Harbor, 

 Massachusetts, and southward to South Carolina, Ravenel ; Chili and Peru, 

 Ruschenberger (J) Jide Tryon. 



This species (to which the figure of P. Mevimingcri T. and H. has a sus- 

 picious resemblance) usually has a tolerably wide anterior gape, and a single 

 accessory valve extending forward from behind the umbones with the nucleus 

 posterior; but in one specimen in the National Museum the plate is divided 

 into two, the anterior elongate and narrow, the posterior (behind the umbones) 

 small and round, and this is the condition figured by De Kay. There seems 

 to be no doubt as to the specific identity of the two variations, which leads 

 to a query as to the systematic value of the characters upon which the name 

 Scobina is based. 



The identity of the form from the west coast of South America with Say's 

 tnincata is doubtful. Perhaps it should rather be united with the Californian 

 type named by Stearns Pholas pqcifica. 



Barnea alatoidea Aldrich. 

 Pholas alatoidea Aldr., Bull. Ala. Geol. Surv., No. i, p. 36, pi. 4, figs. 9 a-c, 1886. 

 Pholas Ropcriaiia Tuomey MS. 

 Bartiea alatoidea Cossmann, Notes Compl. Eoc. Ala., p. 5, 1894. 



Chickasawan Eocene of Bell's and Gregg's Landings, Alabama; Aldrich. 



Ue Gregorio has given the varietal name of Aldrichi to the figure 96 of 

 Aldrich. The species strongly recalls B. Levesqjici Watelet of the Parisian 

 Eocene. 



Genus ZIRF^A (Leach) Gray. 

 ZirfcEa "Leach, 1817," Gray, P. Z. L., 1847, p. 188 ; Ann. Mag. N. Hist., 2d Sen, viii., 



p. 385, 1851. 

 Zirphcsa Leach, Moll. Qt. Brit., pp. 250, 252, 1852. Type Pholas crispata Linne. 

 Thiiiiosia "Leach, Conch. Nomen., 1845," Jide Agassiz in Scudder's Nomenclator, 



1882; (not found.) 



Shell with a radial sulcus dividing the valves into two areas ; accessory 

 plates rudimentary or wanting ; anterior gape large. 



Zirfsea crispata Linne. 

 Afya crispata Linne, Syst. Nat., Ed. x., p. 670, 1758. 

 Pholas crispata Linne, Syst. Nat., Ed. xii., p. 11 11, 1767. 

 Pholas bifrons Da Costa, Brit. Conch., p. 242, pi. 16, fig. 4, 1778. 

 Pholas parva Da Costa, Brit. Conch., p. 247, 1778. (Young shell.) 

 Solen crispus Gmelin, Syst. Nat., vi., p. 3228, 1792. 



