500 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 51. 



MACROCALLISTA (CfflONELLA), species indeterminate. 



cf. Maarocallista ovata Rogers, Trans. Amer. Philos. Soc, new ser., 1837, vol. 5, 

 p. 340, pi. 27, fig. 2, 1839. 



Locality. — Station 7096, on the west bank of Flint River, 7 miles 

 above Bainb ridge, Decatur County, Georgia, at Red Bluff; Vaughan, 

 Cooke, and Mansfield, 1914. U. S. Nat. Mus. Cat. No. 166771. 



Roger's species is from the Eocene of Maryland and Virginia, and 

 is probably not identical with the imperfectly preserved form from 

 Georgia, but the two have a certain similarity, and better specimens 

 of the latter are needed before an exact comparison can be made. 



ANTIGONA (aff.) CAESARINA Dall. 



? Cytherea caesarina Dall, Trans. Wagner Inst. Sci. Phila., vol. 3, 1903, pt. 6, p. 

 1275, pi. 53, fig. 5. 



Localities. — Station 3381, at the base of the bluff at Little Hoi-se- 

 slioe Bend, on the east bank of the Flint River, 4 miles below Bam- 

 bridge, Decatur County, Georgia, just below the mouth of Blue (or 

 Russell) Spring branch; T. W. Vaughan, 1900. Also at station 

 7074, on the west bank of Flint River, 7 miles southeast of Bain- 

 bridge at Hale landing; station 7078, near lower end of Smith's 

 Reach, about a quarter of a mile below Hale landmg; station 7079, 

 at Mascot Point, near station 3381 ; and at station 7096 on the west 

 bank of Flint River at Red Bluff, 7 miles above Bainb ridge; Vaughan, 

 Cooke, and Mansfield, 1914. U. S. Nat. Mus. Cat. No. 166772. 



The A. caesarina was originally described from the sandstone of 

 White Beach near Osprey, Florida, and the Oligocene marl of the 

 Chipola River, Callioun County, Florida. The present species is not 

 sufficiently well preserved for a positive determination of its relations. 



PITARIA (LAMELUCONCHA) SILICIFLUVIA, new species. 



Plate 85, figs. 2, 3. 



Shell small, mflated, arcuate, moderately thick; valves slightly 

 mequilateral, rounded m front and behind with a prominently arcuate 

 base, the inner margins smooth; beaks prominent, inflated, small, 

 conspicuously incurved and prosocoelous, with an impressed and 

 broadly heart-shaped lunule bordered by an impressed line; sculpture 

 of small concentric waves with narrower interspaces; the crests of 

 the waves, at first rounded, become more sharp-edged and crowded 

 toward the basal margin; in the left valve there is no escutcheon; 

 paUial line obscure, but the sinus is apparently small and triangular; 

 the hinge is strongly developed, the middle cardinal largest, the an- 

 terior left lateral strong and subconic. Height of valve, 16; length, 

 19; length behind the vertical from the beaks, 14; double diameter 

 of left valve, 16 mm. 



