IN THE ESNA-IDFU REGION, NILE VALLEY, EGYPT 83 



Globotruncana arabica sp. nov. is also morphologically related to G. lugeoni Tilev 

 and G. youssefi sp. nov. which occur in association with it. It is distinguished from 

 the former by its larger test, its strongly shifted keel towards the dorsal side, its 

 shorter, less curved, depressed dorsal sutures and its much wider umbilicus. It 

 differs from the latter by the fact that G. youssefi has an almost flat dorsal side, or 

 even slightly raised initial part, longer, more curved, raised and beaded dorsal 

 sutures and a truly marginal keel. 



Holotype. P. 45515. 



Paratypes. P. 45516. 



Horizon and locality. Holo- and paratypes from sample No. 22, W. El- 

 Sharawna section. 



Stratigraphical range. The species appears for the first time in the upper 

 part of the Middle Maestrichtian G. gansseri Zone. It increases in number upwards 

 in the section until it floods the uppermost part of this zone and the basal part of the 

 overlying G. esnehensis Zone before dying out completely in the middle part of the 

 latter zone. 



Globotruncana area (Cushman) 



(PI. 1, figs, ia-2) 



1926a Pulvinulina area Cushman : 23, pi. 3, figs. la-c. 



1927a Globotruncana area (Cushman) Cushman : 91, pi. 19, figs. na-c. 



1937a Globotruncana area (Cushman) ; Glaessner : 36, pi. i, figs, ioa-c. 



1946 Globotruncana area (Cushman) ; Cushman (pars) : 150, pi. 62, figs. \a-c (non figs. $a-c). 



195 1 Globotruncana area (Cushman) ; Bandy : 509, pi. 75, figs. la-c. 



1951 Globotruncana area (Cushman) ; Noth : 77, pi. 8, figs, i^a-c. 



1951a Globotruncana area (Cushman) ; Nakkady (pars) : 56, pi. 1, figs. 4B-E, non fig. 4A. 



195 1 Globotruncana area (Cushman) ; Tilev : 57, text-figs. i8a-d, iga-d. (See also Tilev 



1952, where figures are repeated.) 

 !953 Globotruncana area (Cushman) ; Hagn : 97, pi. 8, figs, na-c, text-figs. 20, 21. 

 *953 Globotruncana area (Cushman) ; Subbotina : pp. 185-188, pi. g, figs. ia-5c, pi. io, 



figs. IO-5C. 

 z 955 Globotruncana area area (Cushman) ; Gandolfi (pars) : 63, pi. 5, figs. 3a-c ; non figs. 



2a-c, 4a-c. 



1956 Globotruncana area (Cushman) ; Bronnimann & Brown : 539, pi. 23, figs. 10-12. 



1957 Globotruncana (Globotruncana) area (Cushman) ; Edgell (pars) : no, pi. 3, figs. 4-6 ; 

 non pi. 1, figs. 10-12. 



1957 Globotruncana area (Cushman) ; Bolli, Loeblich & Tappan : 44, pi. n, figs. 6-nc. 



1958 Globotruncana area (Cushman) ; Bieda : 60, text-fig. 24. 



i960 Globotruncana area (Cushman) ; Vinogradov : 313, pi. 5, figs. 2ja-c. 

 1962 Globotruncana area (Cushman) ; Barr : 567, pi. 69, figs. 8a-c. 



Emended diagnosis. A Globotruncana with large, robust, biconvex test ; 

 great number of chambers per test and in last whorl ; two well-developed, much 

 thickened beaded keels ; wide, inclined peripheral band ; curved, much thickened, 

 raised, beaded sutures ; distinct, horseshoe-shaped ridge of beads outlining each 

 chamber on ventral side ; wide umbilicus. 



