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TERTIARY FAUNA OF FLORIDA 



Bornia triangnla n. sp. ? 

 Kellia triangula H. C. Lea, MSS., in Coll. Acad. Nat. Sci. Phila. (Petersburg, Va.). 



Miocene of the coastal plain; three miles west of Centreville, Maryland; 

 York River and Petersburg, Virginia ; Duplin County, North Carolina ; at the 

 Natural Well and Magnolia ; and at Darlington, South Carolina ; Pliocene of 

 the Caloosahatchie and Shell Creek, Florida. 



This is the most common fossil species of our Tertiary. It occurs quite 

 plentifully sometimes, and is readily distinguished from B. mactroides, as a 

 rule, by its shorter, more triangular, and less flexuous shell and the other 

 features mentioned under B. mactroides. The outline is quite uniform as a 

 whole, and the shell almost always easily separated from B. mactroides, for 

 which reason I have retained Lea's unpublished name, though I do not feel 

 wholly confident that both these forms may not eventually prove to be extremes 

 of a single species. 



Bornia rota n. sp. 

 PLATE 45, FIGURE n. 



Miocene of the Natural Well, Duplin County, North Carolina; Burns. 



Shell small, subrotund, compressed, brilliantly polished ; beaks small and 

 low but conspicuous, valves nearly equilateral, the posterior side rounded, the 

 anterior slightly more pointed and produced ; hinge normal, the teeth very 

 small and the posterior lamella nearly obsolete ; scar of the resilium elongate ; 

 adductor scars ovate, the pallial line nearly as wide as the scars where it joins 

 them but narrower below ; margin simple, entire. Lon. 4.2, alt. 3.9, diam. 

 1.6 mm. 



This species is exceptionally small and rounded in its outline. 



Bornia lioica Dall. 

 PLATE 25, FIGURE 6. 

 Bornia lioica Dall, Trans. Wagner Inst, Hi., part iv., p. 920, pi. 25, fig. 6, 1898. 



Pliocene marl of the Caloosahatchie River, Florida ; Dall. 



Shell thin, smooth, compressed, rounded-quadrate, brilliantly polished ; 

 nearly equilateral, the posterior portion higher, more rounded, and longer, the 

 anterior shorter and less broad ; beaks low, small, and almost pointed ; dorsal 

 margins arcuate, the anterior more rapidly descending, the basal margin nearly 

 straight, but towards its posterior end showing four or five subequal, small 

 radial plications which extend but a little way inward over the disk; hinge 



