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1023 



TERTIARY FAUNA OF FLORIDA 



Tellina (Phyllodina) halistrepta n. sp. 

 PLATE 47, FIGURE 17. 



Oligocene of the Bowden marl on the. island of Jamaica ; Henderson and 

 Simpson. 



Shell compressed, flattish, subequi lateral, longer than high; beak small, low, 

 resembling a pustule on the summit of the broad, smooth nepionic shell ; surface 

 marked anteriorly with rather close, low, elevated, concentric threads with 

 about equal interspaces ; near the posterior third of the disk these threads 

 become less numerous by the cessation of alternate threads, making the inter- 

 spaces wider, while the persistent threads become lamellose; in the type, 

 which is a young shell, the dorsal margin is not coronate, but in an adult 

 there are probably dorsal scales corresponding to the later lamellae ; hinge 

 normal for the section, pallial line obscure. Lon. 9, alt. 5.5, diam. 1.2 mm. 



Although this specimen is young, it is sufficiently characteristic and dis- 

 tinct to be recognized, though the adult very likely reaches twice or thrice the 

 size of the one described. 



Tellina (Phyllodina) dodona Dall. 



PLATE 30, FIGURE 7. 

 Tellina dodona Dall, this work, part iv., p. 925, pi. 30, fig. 7, 1898. 



Oligocene sands of Oak Grove, Santa Rosa County, Florida ; Burns. 



Shell elongate, rather rude, solid, subequilateral, inequivalve, the right 

 valve flatter ; beaks low, compressed, with pustular apex and small, smooth 

 nepionic shell ; anterior part produced and rounded, passing evenly into the 

 curve of the base ; posterior end slightly rostrate, with a straight dorsal slope, 

 the end nearly vertically truncate, the posterior basal angle in the left valve, 

 pointed and produced ; surface marked with rather irregular incremental lines, 

 a conspicuous sulcus from the umbo radiating to a point just above the pos- 

 terior basal angle; disk with a succession (up to ten) of low, rather obscure, 

 concentric waves, obsolete distally but indicated by a sparse series of small 

 triangular foliations on the posterior dorsal border, the anterior border being 

 only obscurely waved ; lunule long and very narrow ; hinge normal, pallial 

 sinus short, free, obliquely ascending; sculpture of the right valve similar but 

 sharper, more emphatic, and the foliations more conspicuous. Lon. 34, alt. 

 21, diam. 6 mm. Lon. of figured specimen, 16 mm. 



Since the young valve was figured, a considerably larger left valve has 

 come to light, from which, and from fragments of the right valve, the above 

 description has been drawn. 



