TRANSACTIONS OF WAGNER 



I20O 



TERTIARY FAUNA OF FLORIDA 



(Group of Chione cancellata.} 



Chione chipolana n. sp. 

 PLATE 55, FIGURE 20. 



Oligocene of the Chipola horizon at Alum Bluff and on the Chipola River, 

 Calhoun County, Florida; Dall and Burns. 



Shell moderately convex, in general much resembling C. cancellata, but 

 smaller, with the radial sculpture finer, the radii more numerous, the concentric 

 lamellae more regularly, evenly, and distinctly fluted on the ventral side, the 

 lunule larger, and the pallial sinus more sharply angular. The mutations of 

 the individuals pass through about the same range as in C. cancellata, but 

 modified by the differences above noted. Length of a fully adult specimen 

 32.0, height 25.5, diameter 18.0 mm. 



Chione erosa n. sp. 

 PLATE 55, FIGURES 5, 8. 



Miocene of Florida, sixteen miles southwest of Tallahassee near and at 

 Jackson Bluff (upper bed) ; Vaughan. 



Shell rather large, compressed, the sculpture behind the middle of the disk 

 obsolete, the radial feebly defined, the concentric lamellae little elevated and 

 distant ; hinge normal, the teeth entire ; anterior adductor scar elongated, 

 posterior shorter and smaller ; pallial sinus nearly obsolete ; lunule slightly 

 larger and proportionately narrower than in C. cancellata. Length 35, height 

 32, diameter 17 mm. 



Many of the specimens have the sculpture almost entirely obsolete. 



Chione sp. indet. 



Miocene marl near Petersburg, Virginia ; Burns. 



Two valves in rather worn condition were obtained by Mr. Burns, as stated. 

 They are small, heavy, considerably exfoliated, with a small but sharp and 

 angular pallial sinus, and very rounded, almost orbicular. The concentric 

 lamellae are thick and heavy, and have a tendency to coalesce. The specimens 

 are too imperfect to deserve naming, but indicate very distinctly that a species 

 occurs in the Chesapeake Miocene, 'and they are for that reason noted here. 

 Length 17, height 16, diameter 10 mm. 



Chione cancellata Linn. 



Venus cancellata Linne, Syst. Nat, ed. xii., p. 1130, 1767; Sowerby, Thes. Conch., ii., 

 p. 710, plOJiv., figs. 28-31, 1853. 



