IN THE ESNA-IDFU REGION, NILE VALLEY, EGYPT 147 



Horizon and locality. Hypotype from sample No. 21 , W. El-Sharawna 

 section. 



Rugoglobigerina loetterli (Nauss) 



1947 Globigerina loetterli Nauss: 336, pi. 49, figs. na-c. 



1955 Globotruncana (Rugoglobigerina) loetterli loetterli (Nauss): Gandolfi: 35, pi. i, figs, i^a-c. 



1955 Globotruncana (Rugoglobigerina) loetterli subloetterli Gandolfi: 36, pi. 1, figs, i^a-c. 



Remarks. A few specimens of R. loetterli (Nauss) have been recorded from the 

 top part of the Lower Maestrichtian throughout the Middle and Upper Maestrichtian 

 of the Esna-Idfu region. The species was originally described by Nauss (1947) from 

 the late Cretaceous Lloydminster shale of Alberta, Canada, and was recorded by 

 Gandolfi (1955) from the Maestrichtian, Colon shale of northeastern Colombia. 

 The form described by Gandolfi as G. (R.) loetterli subloetterli is here questionably 

 included in the present species, which occasionally shows an arrangement of surface 

 rugosity in the form of weakly developed pseudo-keels. 



Hypotype. P. 45650. 



Horizon and locality. Hypotype from sample No. 16, W. El-Sharawna 

 section. 



Rugoglobigerina macrocephala Bronnimann 



1952 Rugoglobigerina (Rugoglobigerina) macrocephala macrocephala Bronnimann : 25, pi. 2, 

 figs. 1-3, text-figs. gas. 



1952 Rugoglobigerina (Rugoglobigerina) macrocephala ornata Bronnimann : 27, pi. 2, figs. 4-6, 

 text-figs, loa-i. 



1955 Globotruncana (Rugoglobigerina) macrocephala macrocephala (Bronnimann) ; Gandolfi : 

 45, pi. 2, figs. I2a-c. 



1962 Rugoglobigerina macrocephala Bronnimann ; Berggren : 76-78, pi. 12, figs. i,a-c, text- 

 figs. 9 (ia-4c), 10 (1-5S). 



Remarks. Rugoglobigerina macrocephala floods the Middle and Upper Maestrich- 

 tian of the sections studied. The species was originally described from the Upper 

 Maestrichtian of Trinidad (Bronnimann 1952) and was later recorded from the 

 Maestrichtain of northeastern Colombia (Gandolfi 1955) and of Denmark (Berggren 

 1962). Rugoglobigerina (R) macrocephala ornata Bronnimann is a junior synonym of 

 the present species and so is probably G. (R.) ornata ornata (Bronnimann) of Gandolfi 

 (1955). On the other hand, both G. (R.) macrocephala submacrocephala Gandolfi 

 1955 and G. (R.) ornata subornata Gandolfi 1955, possibly belong to the genus 

 Globotruncana, not Rugoglobigerina. 



Hypotype. P.45651. 



Horizon and locality. Hypotype from sample No. 16, W. El-Sharawna 

 section. 



