IN THE ESNA-IDFU REGION, NILE VALLEY, EGYPT 221 



Hypotype. P. 45617. 



Horizon and locality. Hypotype from sample No. 63, Gebel Owaina section. 



Stratigraphical range. G. nicoli was first described by Martin (1943) from 

 the Paleocene-Lower Eocene Lodo Formation of California. It was also recorded 

 from the Lower Eocene " marne bleue " of Mont Cayala, France, by Gartner & Hay 

 (1962) who assigned it to the Ilerdian, and from the Paleocene Hornerstown forma- 

 tion, New Jersey coastal plain, by Olsson (i960). 



In the Esna-Idfu region, G. nicoli occurs as a rare form in the uppermost Paleocene 

 G. aequa/G. esnaensis Subzone. 



Globorotalia occlusa Loeblich & Tappan 



(PL 20, figs. 2a-d ; PL 22, figs. 4«-c) 



1957a Globorotalia occlusa Loeblich & Tappan : 191, pi. 55, figs. 3a-c ; pi. 64, figs. 3«-c. 

 19606 Globorotalia acutispira Bolli & Cita : 15-17, pi. 33, figs. 3«-c. 



Description. (Specimen, PL 22, figs. <\a-c.) Test medium sized umbilico- 

 convex, coiled in a low trochospire ; dorsal side almost flat, very weakly raised 

 in the centre ; ventral side distinctly protruding ; equatorial periphery roughly 

 ovoid, very weakly lobate to almost entire, with a distinct, thin, marginal 

 keel ; axial periphery sharply acute ; chambers on the dorsal side about 1 1 in number, 

 arranged in 2 sinistrally coiled whorls ; the initial chambers are weakly raised, and 

 almost masked by the surface texture ; the last whorl is composed of 5 large, roughly 

 crescentic chambers, which are strongly elongated in the direction of coiling, and 

 increase gradually in size (however, the last chamber is broken in the figured speci- 

 men and the penultimate chamber is slightly smaller than the ante-penultimate) ; 

 on the ventral side the chambers are 5 (4 + 1 broken), large, angular, conical, 

 roughly triangular, distinctly protruding with their distal ends moderately decorated 

 with fine papillae and approaching very closely around the much narrowed umbilicus ; 

 sutures on the dorsal side curved, moderately raised and delicately beaded ; on the 

 ventral side they are radial and strongly depressed ; umbilicus very small, deep, open, 

 and surrounded with a small, thickened and papillose umbilical shoulder ; aperture 

 interiomarginal, extraumbilical-umbilical ; wall calcareous, perforate ; surface 

 delicately papillose in the early part, smooth later, except for the papillose umbilical 

 shoulder, dorsal sutures, marginal keel, and the early chambers on the ventral side 

 where the beads sometimes taper out in the form of delicate spines, giving the surface 

 a roughly hirsute appearance. 



Dimensions of described specimen. 

 Maximum diameter = 0-41 mm. 

 Minimum diameter = 0-34 mm. 



Thickness = 0-24 mm. 



Remarks. Globorotalia occlusa was first described by Loeblich & Tappan from 

 the Velasco formation of Mexico. These authors (1957a, pi. 45, figs, ya-c, pi. 50, 



