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



Remarks. The forms described by Gandolfi (1955) as G. wiedenmayeri wieden- 

 mayeri and G. wiedenmayeri magdalenaensis are morphologically similar to the 

 present species, and have the same stratigraphical range. They are thus considered 

 to be junior synonyms, as previously mentioned by Berggren (1962). 



Hypotype. P. 45537. 



Horizon and locality. Hypotype from sample No. 18, W. El-Sharawna 

 section. 



Stratigraphical range. The species was recorded by Subbotina (1953) to range 

 through the Campanian-Maestrichtian of the U.S.S.R., and by Gandolfi (1955) from 

 the Campanian-Maestrichtian of northeastern Colombia. In the Esna-Idfu region 

 G. fundiconulosa occurs as a rare form in the Lower Maestrichtian G. fornicata Zone 

 and the lower part of the overlying G. gansseri Zone where it dies out completely. 



Globotruncana gagnebini Tilev 

 (PI. 2, figs, ifl-4^ ; PL 3, figs. la-d, ^a-d, 6) 



1951 Globotruncana gagnebini Tilev : 50-56, pi. 3, figs. 2-5, text-figs, iqa-e, i^a-ijd. 



1951 Globotruncana ventricosa White ; Bolli : 190, text-fig. le. 



1951a Globotruncana cretacea Cushman ; Nakkady (pars) : 57-58, pi. 2, fig. 2D, E, non A-C. 



1952 Globotruncana gagnebini Tilev ; Tilev : 50-56, pi. 3, figs. 2-5, text-figs. i^a-e, 150-170". 

 1955 Globotruncana ventricosa ventricosa (White); Gandolfi : 22, 23 ; pi. 1, figs. ^a-c. 



*955 Globotruncana area caribica Gandolfi : 64, pi. 5, figs. $a-c. 

 1957a Globotruncana gagnebini Tilev ; Bolli : 59, pi. 14, figs. 5a-c. 



Description. (Specimen, PL 2, figs. la-d.) Test large, planoconvex, umbilico- 

 convex, coiled in a very low trochospire ; dorsal side almost flat, ventral side distinctly 

 protruding ; equatorial periphery roughly ovoid, slightly lobate, with two well- 

 developed, thickened, beaded keels enclosing a narrow peripheral band ; axial 

 periphery truncate ; chambers on the dorsal side 14, arranged in 3 dextrally coiled 

 whorls ; the initial ones are small, inflated, globigerine, and increase slowly in size ; 

 the last whorl is composed of 5 J, large, crescentic chambers which are elongated in 

 the direction of coiling and increase very rapidly in size ; on the ventral side the 

 chambers are 5j, large, raised, distinctly protruding, subglobular in the early part 

 and elongate later ; sutures on the dorsal side curved, raised and beaded ; on the 

 ventral side they are radial or very slightly curved forward and depressed ; umbilicus 

 wide, deep, bordered by raised, thick, limbate ridges and covered by complex tegilla 

 of which remnants are still preserved ; primary apertures interiomarginal, umbilical ; 

 tegilla with accessory apertures only poorly preserved ; wall calcareous, perforate 

 except for the imperforate keels, peripheral band and tegilla ; surface smooth except 

 for a few scattered papillae on the early part. 



Dimensions of described specimen. 



Maximum diameter = 0-42 mm. 



Minimum diameter = 0-35 mm. 



Thickness = 0-22 mm. 



