IN THE ESNA-IDFU REGION, NILE VALLEY, EGYPT 227 



typical G. pseudobulloides had evolved from a smooth, finely perforate test. Never- 

 theless, a slight tendency towards an increase in the surface reticulation of test 

 upwards in the section, was observed in the specimens studied. 



On the other hand, G. pseudobulloides is believed to have evolved in several direc- 

 tions, leading to Globorotalia compressa (Plummef), G. imitata Subbotina, G. quadrata 

 (White), G. trinidadensis Bolli, G. tribulosa Loeblich & Tappan and Globigerina 

 triloculinoides Plummer (see discussion under these species and Text-fig. 15). 



Hypotype. P.45621. 



Horizon and locality. Figured specimen, from sample No. 38, Gebel Owaina 

 section. 



Stratigraphical range. The species was first described from the Midway 

 group of Texas, which, according to Loeblich & Tappan (19570, b), is of Danian age. 



All reliable records show that G. pseudobulloides (Plummer) ranges throughout the 

 Lower and Middle Paleocene with a rare occurrence in the basal part of the Upper 

 Paleocene. AU records of the species in rocks older than the Danian or younger than 

 the lower part of the upper Paleocene are erroneous. 



G. pseudobulloides is recorded as ranging throughout the whole Danian at its type 

 locality in Denmark, being common at the base, and less common towards its top 

 (Bronnimann 1953 ; Troelsen 1957 ; Loeblich & Tappan 1957a, b ; Berggren 19606, 

 1962 and Hofker 1960^, i). 



Haynes (1955, 1956) recorded this species from the type Thanetian of England, 

 and it was recently identified by the writer from Thanetian samples kindly provided 

 by Dr. Haynes, and from samples collected by the author ; although the form 

 figured by Haynes (1956, pi. 17, figs. 12, 12b) as Globigerina pseudobulloides Plummer 

 is an Upper Cretaceous Rugoglobigerina species redeposited in the type Thanetian, as 

 examination of his specimens (B.M.N.H., P. 42633) has revealed. 



In the Esna-Idfu region, G. pseudobulloides (Plummer) floods the Lower and 

 Middle Paleocene parts of the sections studied, and dies out completely in the basal 

 part of the Upper Paleocene G. velascoensis Zone. 



Globorotalia pseudomenardii Bolli 

 (PI. 17, figs. ya-8c) 



1926 Pulvinulina membranacea (Ehrenberg) ; Cushman : 608, pi. 21, fig. 10. 

 ? 1928?) Globorotalia membranacea (Ehrenberg) White : 280-281, pi. 38, figs. la-c. 



? 1941 Globorotalia membranacea (Ehrenberg) 

 ? 1944 Globorotalia membranacea (Ehrenberg) 

 ? 1946 Globorotalia membranacea (Ehrenberg) 



Toulmin : 608, pi. 82, figs. 4, 5. 

 Applin & Applin : pi. 5, fig. 2. 

 Cushman & Renz : 48, pi. 8, figs. 15, 16. 



1949 Globorotalia cf. membranacea (Ehrenberg) ; Cushman & Stone : 57, pi. 10, figs. 16a, b. 

 1953 Globorotalia membranacea (Ehrenberg) ; Subbotina (pars) : 205, pi. 16, fig. 13, non 



figs. 7-12. 

 1955& Globorotalia cf. membranacea (Ehrenberg) ; Weiss : 309, pi. 12, figs. 4, 5. 



1955 Globorotalia membranacea (Ehrenberg) ; Dalbiez & Glintzboeckel {in Cuvillier et al., 



1955) : 534. Pi- 1. fi gs- 5«-c- 



1956 Globorotalia membranacea (Ehrenberg) ; Haque : 188-189, pi- 22 < n g s - 3«-c 



