IN THE ESNA-IDFU REGION, NILE VALLEY, EGYPT 151 



Hypotype. P. 45661. 



Horizon and locality. Hypotype from sample No. 16, Gebel Owaina section. 



Hedbergella hessi hessi (Pessagno) 

 1962 Praeglobotruncana hessi hessi Pessagno : 358, pi. 5, figs. 8-12. 



Remarks. A few specimens of Hedbergella hessi hessi are recorded from the upper 

 part of the Lower Maestrichtian (G. fornicata Zone) of the sections studied. It 

 continues as a rare form up to the basal part of the Upper Maestrichtian (G. esnehensis 

 Zone) where it dies out completely. The species was originally described from the 

 Maestrichtian Rio Yauco formation of Puerto Rico. 



Hypotype. P. 45662. 



Horizon and locality. Hypotype from sample No. 16, Gebel Owaina section. 



Hedbergella mattsoni (Pessagno) 



i960 Praeglobotruncana mattsoni Pessagno : 98, pi. 2, figs. 1—3, 6-8. 



1962 Praeglobotruncana mattsoni Pessagno ; Pessagno : 358, pi. 5, figs. 14-16. 



Remarks. Hedbergella mattsoni is rare in the Lower Maestrichtian and in the 

 base of the Middle Maestrichtian of the sections studied. It was originally described 

 from the Maestrichtian Rio Yauco formation of Puerto Rico. 



Hypotype. P.45663. 



Horizon and locality. Hypotype from sample No. 20, Wadi El-Sharawna 

 section. 



Hedbergella monmouthensis (Olsson) 



i960 Globorotalia monmouthensis Olsson : 47, pi. 9, figs. 22-24. 



1962 Praeglobotruncana {Hedbergella) monmouthensis (Olsson) Berggren : 37-41, pi. 8, figs. 

 ia~3c ; text-figs. 4 (ia-^c). 



Remarks. Hedbergella monmouthensis appears in the uppermost part of the Lower 

 Maestrichtian (G. fornicata Zone) of the sections studied. It increases gradually 

 in numbers upwards in the section, becoming common in both the Middle and Upper 

 Maestrichtian (the G. gansseri and the G. esnehensis Zones) ; it dies out completely 

 just below the conglomerate separating the Maestrichtian from the overlying Danian. 

 The species was first described as Globorotalia monmouthensis by Olsson (1960), from 

 the Maestrichtian Redbank formation of New Jersey, but the well developed umbili- 

 cal portici clearly distinguish it from Globorotalia and justify its position in Hedberg- 

 ella. The species was also recorded from the Upper Maestrichtian of Scandinavia 

 (Berggren 1962) and from the Maestrichtian of Belgium, Holland and Scandinavia 

 (Hofker 1956a, 1957a, 1958a, 1959^, 1960a, 1960a 7 , 1960?), where the latter author 

 confused it with Globorotalia pseudobulloides (Plummer), G. corner essa (Plummer), 

 G. quadrata White, and Globigerina linaperta Finlay. Similarly, most records of 



