IN THE ESNA-IDFU REGION, NILE VALLEY, EGYPT 87 



Remarks. Globotruncana bahijae sp. nov. is morphologically rather similar to each 

 of the following Globotruncana species, all of which, except the last, appear in 

 stratigraphically older strata : 



Globotruncana concavata (Brotzen). 



Globotruncana fundiconulosa Subbotina. 



Globotruncana (Rugoglobigerina) pennyi sunpennyi Gandolfi. 



Globotruncana repanda Bolli. 



Globotruncana arabica sp. nov. 



However, it is distinguished from G. concavata (Brotzen) by its more concave 

 dorsal side and less protruding ventral one, widely spaced keels, chambers which 

 increase less rapidly in size and rough surface. 



It differs from G. fundiconulosa Subbotina in its more concave dorsal side, less 

 strongly developed marginal keels, chambers which increase more rapidly in size 

 and radial depressed ventral sutures. 



It is more closely related to the form described by Gandolfi (1955) as G. (Rugo- 

 globigerina) pennyi subpennyi, but differs from it in its concave dorsal side and less 

 protruding ventral one and by its widely spaced marginal keels. It might possibly 

 have evolved from the latter subspecies which appears to be a true Globotruncana 

 (not a Rugoglobigerina), although Gandolfi's description does not allow a definite 

 decision. 



Globotruncana bahijae sp. nov. is distinguished from both G. repanda Bolli and 

 G. arabica sp. nov. by its compressed test, less protruding ventral side, greater 

 number of chambers and widely spaced keels. 



Holotype. P.45518. 



Paratypes. P.45519. 



Horizon and locality. Holo- and paratypes from sample No. 18 W. El-Sharawna 

 section. 



Stratigraphical range. The species appears for the first time in the middle 

 part of the Middle Maestrichtian G. gansseri Zone. It increases in number upwards 

 in the section to flood the upper part of the latter zone and then fades out gradually, 

 disappearing completely before the overlying G. esnehensis Zone. 



Globotruncana conica White 

 (PL 12, figs. 2a-d) 



19286 Globotruncana conica White : 285, pi. 38, figs. ja-c. 

 ? 1950 Globotruncana (Globotruncana) sp. aff. conica White ; Reichel : 614, text fig. yb. 

 ? 195 1 Globotruncana conica White ; Tilev : 67, figs. 22a-d. (See also Tilev 1952 where 

 figures are repeated.) 



1956 Globotruncana conica White ; Said & Kenawy : 150, pi. 5, figs. i6a-c. 



