134 BULLETIN 90, UNITED STATES NATIONAL MUSEUM. 



Leptosiphon Fischer, Ann. Lye. Nat. Hist. N. Y., vol. 10, p. 195, 1872. 



Type, Cyrena carolinensis Hanley. 

 Cyprinella Gabb, Pal. Oal., vol. 1, p. 170, 1864 ; not of Girard, 1856. 

 Diodus Gabb, Pal. Cal., vol. 2, p. 242, 1868 ; new name for Cyprinella Gabb 



not Girard. 



CYRENA (POLYMESODA?) POMPHOLYX Dall. 



Plate 22, figs. 4, 5, 8. 



Cyrena pompholyx Dall, Trans. Wagner Inst., vol. 3, pt. 5. p. 1194, pi. 38, 

 flgs. 7, 8, 1900 ; pt. 0, p. 1445, 1903. 



Tampa silex beds at Ballast Point, Tampa Bay, Florida; Dill, 

 Willcox, and Post. U. S. Nat. Miis. No. 165190. 



This neat species is not at all uncommon in the silex beds and fre- 

 quently beautifully preserved in a pseudomorph of translucent silex. 



Genus VILLORITA Gray. 



Villorita Gray, in Griffith's Cuvier, Moll., p. 601, pi. 31, fig. 5, 1833. Type, 

 Cyrena cyprinoides Wood. 



Villorita Dall, Trans. Wagner Inst., vol. 3, pt. 6, p. 1451, 1903. 



Villarita Philippi, Handb. d. Conch., p. 315, 1853. 



Velorita Gray, Syn. Brit. Mus., pp. 75, 91, 1842 (nude name), fide Gray, 

 Proc. Zool. Soc. Lond., 1847, p. 184 ; Ann. Mag. Nat. Hist., ser. 2, vol. 11, 

 p. 38, 1853.— Deshayes, Cat. Conch. Brit. Mus., vol. 2, p. 219, 1854. 



VILLORITA FLORIDANA Dall. 



Plate 17, figs. 9, 10 ; plate 18, figs. 8, 10, 11. 



Velorita floridana Dall, Trans. Wagner Inst., vol. 3, pt. 5, p. 1199, pi. 43, 



figs. 8, 13, 1900. 

 Villorita floridana Dall, Trans. Wagner Inst., vol. 3. pt. 6, p. 1452, 1903. 



Tampa silex beds, from the ship channel off Ballast Point, 

 Tampa Bay, Florida, from rock dredged up in deepening the chan- 

 nel, containing fossils which have not been silicified. Dall and Post. 

 U. S. Nat. Mus. Nos. 107737, 214304. 



As was stated in my original publication, this fossil has the concho- 

 logical features of the recent species, the V. cyprinoides of Asia, but 

 the combination is one which is probably due to dynamic causes oper- 

 ating upon a species of Cyrena, and which might occur sporadically 

 anywhere within the distribution of the genus Cyrena. The Asiatic 

 or African forms have probably no more intimate connection with 

 the American fossils than that thus indicated, and the same is true of 

 the fossil Batissa from the Puget Group and its South Sea analogues. 

 The "genus" Hinnites is another form in which it is unlikely that 

 there is any genetic connection between the species occurring in dif- 

 ferent horizons except what is furnished by the genus Pecten, from 

 which Hinnites species are probably mere " sports." 



