-4ET. 19 EORAMINIFEEA FROM TENNESSEE BERRY AND KELLEY H 



Family GLOBIGERINIDAE 



Genus GLOBIGERINA d'Orbigny, 1826 



GLOBIGERINA CRETACEA d'Orbigny 



Plate 3, Figures 7, 8, 9 



■Globigerina cretucea d'Orbigny, Mem. Soc. Geol. France, ser. 1, vol. 4, 1840, p. 

 34, pi. 3, figs. 12-14.— H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 9, 

 1884, p. 596, pi. 82, figs. lOa-c (?).— Cushman, J. A., Foram. of the Phil- 

 ippine and Adjacent Seas, U. S. Nat. Mus. Bull. 100, 1921, p. 287. 



Test composed of numerous inflated chambers arranged in a 

 slightly trochoid nautiloid spiral, chambers all visible from above, 

 very umbilicate below with only the chambers of the last formed 

 whorl visible, chambers usually 5-6 in number in the last whorl; 

 wall thin, reticulate with slight traces of spine bases; apertures of 

 chambers open into the umbilical cavity. 



Diameter, 0.46 mm. 



This species is a most cosmopolitan one. It is found world wide 

 from the Cretaceous up to and in the recent seas. It is widely dis- 

 tributed in the American Cretaceous. I have identified this as G. 

 cretacea rather than G. dubia because of its small size and general 

 appearance. 



PUsiotype.— Cat. No. Y3681, U.S.N.M. 



Family ROTALIIDAE 

 Genus DISCORBIS Lamarck, 1804 



DISCORBIS RIPLEYENSIS W. Berry, new species 



Plate 3, Figures 16, 17, 18 



Test biconvex, smooth, few chambers usually 6-7 in the last formed 

 coil, all visible on the dorsal side, only those of the last formed 

 whorl on the ventral side; periphery margin subcarinate; sutures 

 distinct, those on the dorsal side limbate, even, ventral ones indis- 

 tinct and slightly limbate near the slight umbo developed on the 

 ventral side; aperture a narrow slit extending backward from the 

 margin toward the umbilical region. 



Diameter, 0.50 mm. 



This species, which is well characterized, seems closest in its rela- 

 tionship. to D. hertJieloti var. haconica Hantken, but differs very much 

 in i\\e sutures and in the degree of convexity. D. Hpleyensis is 

 easily distinguished by its heavy limbate sutures and margin. 



H olotype. —C^t. No. 73682, U.S.N.M. 



