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1183 



TERTIARY FAUNA OF FLORIDA 



Gabb,* corresponding to the more compressed Eocene forms like ungulina; 

 a Fclaniclla the analogue of D. nana of the Eocene, and a Phlyctlderma of 

 which the Eocene analogue, if any, has. not yet been recognized. The same is 

 the case with the Miocene, Pliocene, and recent faunas. 



. 



Diplodonta (Felaniella) minor n. sp. 

 PLATE 44, FIGURE 17. 



Oligocene marl of Bowden, Jamaica ; Henderson and Simpson. 



Shell small, moderately convex, smooth, polished, oblique, inequilateral, the 

 lower anterior side produced, the posterior side shorter, rounded ; margins 

 simple, pallial line and adductor scars normal, the right anterior cardinal sub- 

 marginal, rather long; the posterior cardinal short, vertical, deeply bifid, the 

 beaks low and pointed, both the left cardinals short, the anterior bifid. Alt. 

 4.5, lat. 3.8, diam. 2.5 mm. 



This is very similar to the Claibornian D. nana and to the young of the 

 Mediterranean D. apicalis Philippi. 



Diplodonta ( Phlyctiderma ) puncturella n. sp. 

 PLATE 45, FIGURE 26. 



Oligocene marl of Bowden, Jamaica, Henderson and Simpson ; recent, 

 Jamaica, United States Fish Commission. 



Shell small, thin, rounded, moderately convex, with inconspicuous beaks, 

 outline nearly circular, the beaks smooth, but the rest of the external surface 

 closely minutely punctate all over, other characters as in typical Diplodonta, 

 like D. capuloides, but less turgid. Alt. 6.7, lat. 6.5, diam. 4.0 mm. 



The punctation of the surface is very close and regular, not pustulose, 

 like most of the species of this section. 



Diplodonta alta Dall. 



PLATE n, FIGURES ga, $b; PLATE 44, FIGURE 19. 

 Diplodonta alta Dall, Trans. Wagner Inst., in., p. 189, pi. n, figs, ga-b, 1890 



Chipola Oligocene of the Chipola River, the lower bed at Alum Bluff, and 

 the Ballast Point silex beds of Tampa, Florida ; also in the Alum Bluff beds 

 at Oak Grove, Santa Rosa County, Florida ; Dall and Burns. 



* Geol. St. Domingo, 1873, p. 252 ; not of Carpenter, P. Z. S., 1855, p. 230. This 

 species, since Gabb's name is preoccupied, may be called D. Gabbi. 



