TRANSACTIONS OF WAGNER 

 1268 



TERTIARY FAUNA OF FLORIDA 



Pitaria (Lamelliconcha) imitabilis Conrad. 

 Cytherea imitabilis Conrad, Proc. Acad. Nat. Sci. Phila., iii., p. 292, 1848; Journ. Acad. 



Nat. Sci. Phila., 2d Ser., i., p. 123, pi. xiii., fig. 14, 1848. 

 Dione imitabilis Conrad, Am. Journ. Conch., i., p. 6, 1865 ; Checkl. Eoc. Fos., p. 28, 1866. 



Lower Oligocene of Vicksburg, Mississippi, in both upper and lower beds ; 

 of Johnson's sink, Levy County, and Martin Station, Marion County, Florida ; 

 Willcox. 



A very characteristic Vicksburgian species. 



Pitaria (Lamelliconcha) planivieta Guppy. 

 Cytherea (Callista} planivieta Guppy, Quart. Journ. Geol. Soc. Lond., xxii., p. 292, pi. 



xviii., fig. 3, 1866. 

 Callista planivieta Gabb, Geol. St. Domingo, p. 250, 1873. 



Oligocene of the Bowden marl, Jamaica, and of St. Domingo, Guppy and 

 Gabb ; of White Beach, near Osprey, Florida, Dall. 



This identification is probable but not absolute, as the White Beach fossils 

 are pseudomorphs in rather imperfect preservation. 



Pitaria (Lamelliconcha) Hillii n. sp. 

 PLATE 54, FIGURE 7. 



Oligocene of the vicinity of Gatun on the line of the Panama Canal, 

 Colombia. 



Shell elongated, moderately convex, ovate, inequilateral, the beaks within 

 the anterior third, moderately prominent ; lunule small, impressed, lanceolate ; 

 surface sculptured with narrow, low, roundish ribs with narrower deep sulci 

 between them ; an obscure ridge extends from the beaks to the lower posterior 

 margin, which it almost angulates ; anterior end rounded, base gently arcuate ; 

 posterior end blunt rather than truncate ; hinge obscured by the matrix ; pallial 

 sinus deep, reaching beyond the middle line of the shell, rather narrow. Length 

 about 36, height 22, diameter 13 mm. 



This has somewhat the aspect of a Paphia, but until the hinge is better 

 known in all probability it will be most suitably placed here. A larger, some- 

 what rudely concentrically striated species also occurs in the same beds but is 

 represented by such inadequate material in our collection that I refrain from 

 attempting to describe or name it. 



The preceding species have been placed under Pitaria in Lamelliconcha, 

 though in some respects they seem more nearly related to Macrocallista. I am 



