TRANSACTIONS OF WAGNER 

 1426 



TERTIARY FAUNA OF FLORIDA 



subrostrate, terminally rounded; sculpture of about twenty-five low, carinate, 

 obscurely beaded radial ribs, of which the posterior ten are nearly simple, the 

 others acccompanied, more or less distinctly, by smaller lateral threads, one on 

 each side ; basal margin slightly incurved, lunule small, hinge of Venericardia, 

 inner margin crenulated rather deeply. Length 41, height 27, diameter 26 

 mm., the anterior end 6 mm. before the vertical of the beaks. 



This form has much the outline of a Cardita but all the usual characters of 

 Venericardia. Mr. Johnson labelled it as from the Midway horizon, but this 

 may have been only a surmise, no outcrop of that horizon being mapped in 

 the county, and no exact locality assigned to the type specimen. 



Venericardia wilcoxensis n. sp. 



PLATE 54, FIGURE 12. 



Venericardia alticostata var. Harris, Bull. Am. Pal., i., p. 171, pi. iv., fig. 12, 1896; not of 

 Conrad. 



Upper clayey layers of the Midway stage of the Eocene in Wilcox County, 

 Alabama, near Graveyard Hill. 



Shell short, high, rounded, with full, prosogyrate beaks over a small, convex 

 lunule at the anterior sixth ; sculpture of thin, sharp, high, serrate or pustulose 

 ribs separated by much wider roundly excavated interspaces ; a few ribs on the 

 posterior and anterior dorsal slopes are more prominently pustular than the 

 rest ; on the disk the short slopes of the serrations are on the umbonal side ; 

 there are about twenty-six ribs in all, which are usually, but not invariably, 

 simple, one specimen out of ten collected may show parallel threads in the 

 interspaces ; the posterior end is very slightly subtruncate, the anterior evenly 

 rounded; the hinge is solid and normal; the fluting of the inner margins is 

 rather coarse. Length 36, height 34, diameter 30 mm. 



Compared with the roundest V . alticostata in a large collection, this species 

 is less elongate, has much higher beaks, thinner, sharper, and more elevated 

 ribs ; the attendant riblets in the variety tripla, which has them, are finer and 

 sharper ; the prominences of the sculpture are sharper and higher. 



We have also received this species from Matthew's Landing, Nanafalia 

 Bluff, and the Sepulga River, Alabama, all Midway horizons. 



Venericardia simplex n. sp. 



PLATE 56, FIGURE 12. 



Chickasawan (or Lignitic) Eocene of Wood's Bluff, Clarke County, Ala- 

 bama ; Frank Burns. 



