FAUNA OP ORTHAULAX PUGNAX ZONE. 155 



CORBULA (CUNEOCORBULA) BURNSII Dall. 



Plate 18, figs. 4, 5. 



Cor'bula (Cunecocorhula) cngonata var. hurnsii Dall, Trans. Wagner Inst., 

 vol. 3, pt. 4, p. 847, 1898. 



Oligocene of the Tampa silex beds at Ballast Point, Tampa Bay ; 

 of the lower bed at Alum Bluff, Chattahoochee River; and of the 

 Chipola marl, near the county bridge over the Chipola River, Cal- 

 houn County, Florida. Burns and Dall. U. S. Nat. Mus. Nos. 

 166119, and 154509. 



This differs from C. engonata, from which it is probably descended, 

 in its large size and more prominently arcuate base. The former 

 is from the Eocene and Vicksburgian. 



CORBULA (CUNEOCORBULA) SARDA Dall. 



Plate 17, fig. 2. 



Corhula (CtineocorMila) sarda Dall, Trans. Wagner Inst., vol. 3, pt. 4, 

 p. 847, pi. 36, fig. 14, 1898. 

 Oligocene of the Tampa silex beds at Ballast Point, Tampa Bay, 



and of the lower bed at Alum Bluff, Chattahoochee River, Calhoun 

 County, Florida. U. S. Nat. Mus. No. 165223. 



This species, though more delicate, recalls Corhula aldbamiensis 

 Lea, but is less twisted and pointed behind. 



CORBULA (CUNEOCORBULA) KAGHRIANA, new species. 



Plate 21, figs. 4, 5. 



Shell small, inequivalve, plump, behind pointed and almost ros- 

 trate; left valve smaller; beaks small pointed, prosocoelous, not 

 prominent ; there is no lunule ; a wide, strongly concentrically striate 

 posterior dorsal area is bounded by a strong keel on each side ; both 

 valves are sculptured by strong concentric rounded ridges with wicler 

 interspaces; the ridges anteriorly sharp and appear even slighth^ 

 recurved toward the beaks; behind they cease at the keels; the margin 

 of the right valve below is tortuous and folded over the margin of 

 the left valve behind; the dorsal margins between the keels pout 

 prominently. Length 10, height 6.2, maximum diameter 5 mm. 



Tampa silex beds at Ballast Point, Tampa Bay, Florida. U. S. 

 Nat. Mus. No. 165224. Also recent. 



A species identical with this was sent by the late Professor C. B. 

 Adams from Jamaica, West Indies, to the Smithsonian Institution 

 under the above name, which appears never to have been published. 



