IN THE ESNA-IDFU REGION, NILE VALLEY, EGYPT 239 



belong to G. emilei sp.nov. or represent a transitional stage between it and G. troelseni. 

 This is substantiated by the stratigraphical range assigned to this species by Berg- 

 gren (1960c). 



Hypotype. P. 45633. 



Horizon and locality. Figured specimen, from sample No. 68, Gebel Owaina 

 section. 



Stratigraphical range. This species was described from the Nanafalia 

 formation of Alabama and the upper part of the Velasco formation of Mexico, which 

 Loeblich & Tappan (1957a) considered to be of Lower Eocene and Upper Landenian 

 age respectively. However, the Nanafalia formation was considered to be of 

 Upper Paleocene age on account of its nannoplankton (Bramlette & Sullivan 1961) 

 and of its planktonic Foraminifera (Gartner & Hay 1962). 



In the Esna-Idfu region G. troelseni appears as a rare form in the upper part of the 

 Upper Paleocene G. velascoensis Zone. It crosses the Paleocene-Lower Eocene 

 boundary and continues in the overlying G. i&ilcoxensis Zone. 



Globorotalia uncinata carinata subsp. nov. 

 (PI. 19, figs, za-d) 



Diagnosis. A Globorotalia uncinata with planoconvex test, thickened, nodose 

 keel, imbricate dorsal side and rougher surface. 



Description. Test medium-sized, almost planoconvex, coiled in a very low 

 trochospire ; dorsal side flat, imbricate ; ventral side strongly protruding ; equatorial 

 periphery ovoid, distinctly lobate ; axial periphery angular with a well-developed, 

 very thick, heavily papillose or rather nodose keel ; chambers, as seen on dorsal side, 

 15, arranged in z\ dextrally coiled whorls ; the inital ones are small, inflated and 

 globigerine ; the last whorl is composed of 6, relatively large, almost crescentic, over- 

 lapping chambers, which increase slowly in size in the early part and rapidly 

 later ; on the ventral side the chambers are 6, relatively large, strongly protruding, 

 angular conical and increase rapidly in size towards the last chamber ; sutures on the 

 dorsal side curved, depressed in the early part, strongly curved, depressed later, 

 although they are marked by the thick, papillose, marginal keel as it curves on the 

 dorsal side encircling the periphery of each chamber ; on the ventral side the sutures 

 are almost straight, radial and strongly incised ; umbilicus small, deep and open ; 

 aperture a low arch, interiomarginal, extraumbilical-umbilical ; wall calcareous, 

 perforate ; surface rough, heavily papillose, with the roughness decreasing gradually 

 towards the last chamber ; the marginal keel is very thick, heavily papillose or even 

 nodose. 



Dimensions of holotype. 



Maximum diameter = 0-37 mm. 



Minimum diameter = 0-24 mm. 



Thickness = 0-21 mm. 



