IN THE ESNA-IDFU REGION, NILE VALLEY, EGYPT 197 



ensis Zone. Although one specimen, probably referable to this subspecies, was 

 found in the uppermost part of the G. velascoensis Zone, this subspecies is still 

 considered to be mainly restricted to the upper part of the Middle Paleocene. 



Globorotalia angulata angulata (White) 

 (PI. 22, figs. la-c) 



1928a Globigerina angulata White : 191-192, pi. 27, figs. i$a-c. 



19375 Globorotalia angulata (White) Glaessner (pars) : 383, pi. 4, figs. 35, 37, non fig. 36. 

 1947 Globorotalia conicotruncata Subbotina (pars) : 115, pi. 4, figs, n-13 ; pi. 9, figs. 9-11. 

 1953 Acarinina conicotruncata (Subbotina) Subbotina (pars) : 220-222, pi. 20, figs, ioa-c, 

 \ia-c, ? na-c, non figs. $a-gc. 



1955 Truncorotalia angulata (White) ; Dalbiez & Glintzboeckel (in Cuvillier et al., 1955) : 



533. 534- Pi- I. fig s - 5«-c- 



1956 Globorotalia angulata (White) ; Sjutskaya : 92-93, pi. 3, figs. 2a-c. 



1956 Globorotalia angulata (White) var. praepentacamerata Sjutskaya ; 94-95, pi. 3, figs. 3«-c. 



19576 Globorotalia angulata (White) ; Bolli : 74, pi. 17, figs. 7-9. 



1957a Globorotalia angulata (White), Loeblich & Tappan (pars) : 187, pi. 48, figs. 2a-c ; 

 pi. 55, figs, la-c, 6a-c, ja-c ; pi. 58, figs, za-c ; pi. 64, figs. $a-c ; non pi. 45, figs, ja—c, 

 and pi. 50, figs. 4a-c. 

 ? 1957a Globorotalia apanthesma Loeblich & Tappan : 187, pi. 48, figs. la-c. 

 ? 1959 Globorotalia quadrata Nakkady & Talaat ; in Nakkady : 462, pi. 7, figs. 3a-c. 



i960 Globorotalia angulata (White) ; Olsson : 44, pi. 8, figs. 14-16. 



1960& Globorotalia angulata (White) ; Bolli & Cita : 18-19, pi- 33, fig s - 8a-c. 



1962 Globorotalia angulata (White) ; Gartner & Hay : 559-560, pi. 1, figs. 6a-c. 



Description. Test medium sized, planoconvex, umbilico-convex, coiled in a 

 very low trochospire ; dorsal side almost flat or very slightly inflated, with an imbri- 

 cate appearance ; ventral side distinctly convex and strongly protruding ; equatorial 

 periphery roughly quadrangular and distinctly lobate ; axial periphery subacute 

 with a few stout, spine-like projections but without keel ; chambers on the dorsal 

 side 15, arranged in 3, dextrally coiled whorls ; the initial chambers are smaU, 

 slightly inflated, roughly globigerine, and increase slowly and regularly in size till the 

 beginning of the second whorl where they start to enlarge rapidly and become 

 roughly crescentic ; the last whorl is composed of 4§, large, slightly inflated chambers, 

 the last of which is smaller than the penultimate ; on the ventral side the chambers 

 are \\, large, strongly inflated, distinctly angular and strongly truncate laterally ; 

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

 straight, radial, strongly incised ; umbilicus roughly rectangular in outline, exceed- 

 ingly small, deep and open ; aperture a long, narrow slit, interiomarginal, extra- 

 umbilical-umbilical with a delicate, narrow lip ; wall calcareous, finely perforate, 

 surface granular or rather pitted. 



Dimensions of described specimen. 



Maximum diameter = 0-390 mm. 

 Minimum diameter = 0-290 mm. 



Thickness = 0-250 mm. 



