2i 4 UPPER CRETACEOUS-LOWER TERTIARY FORAMINIFERA 



Globorotalia faragi possibly evolved from Globigerina arabica sp. nov. by a reduction 

 in the size of test, number of chambers, height of the dorsal spire, and by the 

 development of the extraumbilical-umbilical aperture. On the other hand, G. faragi 

 is believed to have evolved into G. cf. convexa by a loss of globularity of the 

 test, and by the development of flat, crescentic, tightly coiled, strongly overlapping 

 chambers which become roughly quadrangular in the later part. The stratigraphical 

 ranges of these species support this hypothesis. 



This species is named after Professor I. A. M. Farag, Cairo University. 



Holotype. P.45608. 



Paratypes. P.45609. 



Horizon and locality. Holo- and paratypes from sample No. 34, Gebel 

 Owaina section. 



Stratigraphical range. The species ranges from the uppermost Danian to the 

 uppermost Paleocene, being common in the Middle Paleocene and rare in the 

 Upper Paleocene. 



Globorotalia hispidicidaris Loeblich & Tappan 

 (PL 21, figs. $a-c) 

 1957a Globorotalia hispidicidaris Loeblich & Tappan : 190, pi. 158, figs. la-c. 



Description. Test large, umbilico-convex, coiled in a low trochospire ; dorsal 

 side gently convex ; ventral side strongly protruding ; equatorial periphery circular, 

 moderately lobate and heavily spinose ; axial periphery angular ; the concentrated 

 nodes and spines along the periphery simulate a marginal pseudo-keel, although the 

 species is typically non-keeled ; chambers on the dorsal side 17 in number, increasing 

 slowly in size and arranged in 3 dextrally coiled whorls ; each whorl is lightly raised 

 relative to the one following ; the initial chambers are small, inflated, globigerine, 

 almost masked by the surface rugosity, and are followed by large, crescentic, slightly 

 inflated chambers ; the last whorl is composed of 6 large, roughly crescentic to 

 quadrangular chambers which increase slowly in size except for the last, which is 

 slightly smaller than the penultimate ; on the ventral side the chambers are 6, large, 

 high, conical, almost equal in size and meet in a relatively high umbilical shoulder ; 

 sutures on the dorsal side curved, depressed ; on the ventral side they are radial, 

 strongly incised ; umbilicus wide, deep and open ; aperture interiomarginal, extra- 

 umbilical-umbilical, a long, narrow slit extending to the periphery ; wall calcareous, 

 perforate ; surface rough, distinctly nodose and heavily spinose, with the nodes and 

 spines concentrated along the periphery simulating a thick, spinose, pseudo-keel. 



Dimensions of described specimen. 



Maximum diameter = 0-44 mm. 



Minimum diameter = 0-37 mm. 



Thickness = 0-29 mm. 



Remarks. Globorotalia hispidicidaris is distinguished by its large, heavily 

 spinose test ; its numerous chambers which increase slowly in size ; its gently convex 



