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I 347 



TERTIARY FAUNA OF FLORIDA ^' 



large and strong, the posterior obsolete ; the posterior cardinal slightly grooved ; 

 margin with traces of crenulation anteriorly ; scars normal. Height 27.0, 

 length 29.0, diameter 12.0 mm. 



Codakia orbicularis Linne". 



Venus orbicularis Linne, Syst. Nat., ed. x., p. 688, 1758. 

 Venus tigerina var. Linne, Syst. Nat., ed. xii., p. 1134, 1767. 

 Cytherea tigerina Lamarck, An. s. Vert., v., p. 574 (ex parte, non C. tigrina Lam., op. 



cit., p. 569), 1818. 



Lucina tigerina Reeve, Conch. Icon., vi., Lucina, pi. i., fig. 3, 1850; not of Linne, 1758. 

 Lucina pusilla Gould, Proc. Bost. Soc. N. Hist., viii., p. 282, 1862 (nepionic shell) 

 Not Lucina orbicularis Sowerby, Geol. Trans., 2d Ser., iv., p. 341, pi. xvi., fig. 13, 1837; 



nor Deshayes, Expl. Sci. a la Moree, p. 95, pi. xxii., figs. 6, 8, 1836. 

 f = Chama le codok Adanson, Senegal, p. 223, pi. xvi., 1757. 



Pliocene marls of the Caloosahatchie and Shell Creek, Willcox, Dall, and 

 Burns ; Pleistocene of the West Indies and Florida Keys ; recent from St. 

 Augustine, Florida, and Bermuda, southward throughout the West Indies, 

 the eastern shores of Central and the north shore of South America in shallow 

 water. 



This shell, well known under the erroneous name of Lucina tigerina, ap- 

 pears to have suffered no change whatever from Pliocene to recent time. The 

 young nepionic shells are more inequilateral, more inflated, and in general of 

 a very different aspect, so that it is not surprising that this stage, which is 

 hardly to be discriminated from the same stage in species of Jagonia, should 

 have been described by Dr. Gould as a distinct species. 



Codakia (Jagonia) pertenera n. sp. 

 PLATE 51, FIGURE 4. 



Oligocene of the Bowden marls, Jamaica; Henderson and Simpson. 



Shell rather large, very thin, with the surface more or less irregularly in- 

 dented, as if from nestling; anterior end longer, attenuated; posterior end 

 more plump, obscurely vertically truncate ; beaks low ; lunule long and very 

 narrow, not deeply impressed ; surface finely, closely, concentrically, and radi- 

 ally striated, but so feebly that no obvious cancellation results ; hinge-margin 

 narrow, hinge-teeth feeble, the laterals in the left valve obsolete or absent; 

 scars lucinoid ; margin sometimes smooth, sometimes obsoletely fluted. Height 

 32.5, length 35.0, diameter 13.5 mm. 



This species is not a characteristic Jagonia, but is nearer to this group than 

 to any other. 



