FAUNA OF ORTHAULAX PUGNAX ZONE. 157 



GASTROCHAENA ROTUNDA Dall. 



Plate 19, fig. 2. 



Gastrochaena (ovata Sowerby var.) rotunda Dall, Trans. Wagner Inst., 

 vol. 3, pt. 4, p. 825, 1898. 



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

 of the Chipola marl of the Chipola River, near the county bridge, 

 Calhoun County, Florida; and of the Bowden beds at Bowden, 

 Jamaica, West Indies. U. S. Nat. Mus. No. 114705. 



This form resembles G. ovata of the same size, but does not attain 

 so large a size as the adult ovata, and has a more rounded posterior 

 end with a rather shorter gape, the myophore being decidedly 

 larger, wider, and more conspicuous. Lon. 7.0, lat. 3.5, diam. 2.8 mm. 



FORAMINIFERA. 



Genus ORBITOLITES Lamarck. 



Orbitolites Lamarck, Syst. An. s. Vert., 1801, p. 376. First species, O. com- 



planata Lamarck. 

 OrhuUtes Deshayes, ed. An. s. Vert., 1836, vol. 2, p. 302. 

 Nemophora Conrad, Proc. Acad. Nat. Sci. Phila., vol. 17, 1865, p. 74. Same 



type, Nummulites floridana Conrad. 



ORBITOLITES FLORIDANUS Conrad. 



Plate 20. fig. 5 ; plate 21, figs. 7, 11. 



? Orbitolites coniplanata Lamarck, Syst. A'n. s. Vert., 1801, p. 376. Fossil 



of Grignon. 

 ? OrMtuUtes complanata, various Authors. 

 Nwmmulites (Assilina) flondanus Conrad, Amer. Journ. Sci., new ser., 



vol. 2, 1846, p. 399, fig. 3. 

 Cristellaria ? floridana Orbigny, Prodr. Paleont., vol. 2, p. 406, 1300, 1857. 

 Nemophora floridana Conrad, Proc. Acad. Nat. Sci., vol. 17, 1865. p. 74. 



Abundant in the Tampa silex beds, and in the overlying lime- 

 stone, and in silicified rock from Martin Station, Florida. U. S. 

 Nat. Mus. No. 165225. 



This species was identified by Doctor Bagg with O. complanatus. 

 It seems, however, that the identification is doubtful. I therefore 

 retain Conrad's name, about which there is no doubt, until the ques- 

 tion is cleared up. It is remarkable for its variations as indicated 

 in the figures given herewith. 



CORALS. 



The corals of this formation have been put in the hands of Dr. T. 

 Wayland Vaughan for description. They comprise many species 

 of great interest. See list on page 18. 



