ioo UPPER CRETACEOUS-LOWER TERTIARY FORAMINIFERA 



Nakkady & Osman (1954) described G. esnehensis from the Campanian-Maestrich- 

 tian of southern and western Sinai, Egypt and it was recorded from the Maestrichtian 

 of northern Sinai (Said & Kenawy 1956), the Maestrichtian of the Farafra Oasis 

 (Said & Kerdany 1961) and from the Lower Maestrichtian of northwestern Germany 

 and Holland (Hofker 1956&). 



In the Esna-Idfu region G. esnehensis appears in the basal part of the Middle 

 Maestrichtian Globotruncana gansseri Zone as a common form, increases gradually 

 upwards in the section, flooding the upper part of the Maestrichtian and character- 

 izing the Globotruncana esnehensis Zone, the upper part of which is truncated by the 

 disconformity separating it from the overlying basal Tertiary rocks. 



Globotruncana far eedi sp. nov. 

 (PI. 9, figs. 4a-d) 



? 1946 Globotruncana rosetta (Carsey) ; Keller : 102, pi. 2, figs. 17-19, pi. 3, fig. 6. 

 ? 1955 Globotruncana rosetta insignis Gandolfi : 67, pi. 6, figs. 2a-c. 

 1956 Globotruncana falsostuarti Sigal ; Knipscheer : 54, pi. 4, figs. 13a, b, i6a-c, text-fig. 4. 



Diagnosis. A Globotruncana with large, circular, biconvex test ; distinctly 

 lobate periphery ; characteristic, roughly quadrangular chamber shape on both 

 sides ; entirely single keel ; short, nearly radial, depressed, sutures on ventral side ; 

 raised, thickened, beaded, imbricate umbilical ridges, and wide, peculiarly-shaped 

 umbilicus. 



Description. Test large, circular, biconvex ; dorsal side arched ; ventral side 

 moderately protruding ; periphery circular, distinctly lobate, transversally acute, 

 with a single well-developed, beaded keel ; chambers on the dorsal side 18, arranged 

 in 3 dextrally coiled whorls ; initial chambers small, inflated, globigerine, followed by 

 roughly quadrangular chambers which increase regularly in size ; the last whorl is 

 composed of 6 large, quadrangular chambers which are very slightly elongated in the 

 direction of coiling ; on the ventral side the 6 large, roughly quadrangular chambers 

 are moderately inflated especially around the umbilicus, and taper out gradually 

 towards the periphery ; sutures on the dorsal side slightly curved in the early part, 

 nearly straight in the last part, raised and beaded ; on the ventral side the sutures 

 are very slightly curved or nearly straight, radial and strongly depressed especially 

 towards the periphery, while towards the umbilicus they are slightly raised, thickened 

 and beaded before curving around the umbilicus and joining to form a much thick- 

 ened, raised, beaded umbilical flange ; umbilicus wide, deep, roughly hexagonal, 

 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 keel and tegilla ; surface 

 smooth and finely porous. 



Dimensions of holotype. 



Maximum diameter = 0-47 mm. 



Minimum diameter = 0-44 mm. 



Maximum thickness = 0-22 mm. 



