IN THE ESNA-IDFU REGION, NILE VALLEY, EGYPT 209 



last one, are slightly inflated ; ventral side moderately inflated ; equatorial periphery 

 roughly ovoid, elongate and moderately lobate ; axial periphery bluntly acute, with a 

 faintly developed pseudo-keel on the last chamber ; chambers on the dorsal side 

 nearly 13, arranged in two dextrally coiled whorls ; the initial chambers are very 

 small, indistinct and are followed by crescentic, overlapping chambers ; the last 

 whorl is composed of 6, large, slightly inflated, compressed chambers which increase so 

 rapidly in size that the last chamber constitutes about J of the test ; the 6 chambers 

 on the ventral side increase rapidly in size and are inflated, triangular to sub-globu- 

 lar ; sutures on the dorsal side curved, strongly depressed ; on the ventral side they 

 are nearly radial and distinctly depressed ; umbilicus elongate in outline, fairly wide 

 and open ; aperture a low, narrow arch, interiomarginal, extraumbihcal-umbilical ; 

 wall calcareous, perforate ; surface delicately papillose in the early part, becoming 

 smoother towards the last chamber. 



Dimensions of holotype. 



Maximum diameter = 0-34 mm. 



Minimum diameter = 0-22 mm. 



Thickness = 0-14 mm. 



Main variation. 



1. Chambers in the last whorl 4-6. 



2. Coiling is fairly random but with a tendency to be dextral ; (of 47 specimens 



studied, 28 coiled dextrally). 



3. The axial periphery is either rounded or pinched out to form a thin pseudo-keel. 



Remarks. Globorotalia emilei sp. nov. is morphologically similar to G. compressa 

 (Plummer), G. inflata Hussey, G. planoconica Subbotina, G. pseudomenardii Bolli 

 and G. psendoscitula var. elongata Glaessner. It is distinguished from G. compressa 

 by its larger, less compressed test, radially elongate last chamber and partially 

 developed marginal keel. Globorotalia inflata Hussey which was described from the 

 Eocene, Claiborne, Cane River formation of Louisiana, is morphologically very 

 similar, although it was very briefly described. However, apart from the difference 

 in stratigraphical range it appears to be more planoconvex, strongly umbilico-convex, 

 with a much deeper umbilicus and a well-developed apertural lip, and to lack the 

 partially developed marginal keel. Globorotalia planoconica Subbotina is much 

 smaller, with a planoconvex more tightly coiled test, a much narrower umbilicus, less 

 radially elongate last chamber, an occasional entire keel and an apertural lip. 

 G. pseudomenardii Bolli is distinguished by its chambers which increase more rapidly 

 in size, its well-developed marginal keel and sharply acute axial periphery. G. 

 pseudoscitula var. elongata Glaessner is much smaller, has a raised dorsal spire with a 

 much flattened last chamber, more tightly coiled test, less lobate periphery and more 

 curved ventral sutures. It was described from the so-called Lower Eocene of 

 northwestern Caucasus, while the present species was only recorded from the Middle 

 and lower Upper Paleocene. Glaessner's variety needs more detailed description 

 and its stratigraphical range needs to be more precisely defined to prove its relation- 

 ship to the present species, which may represent the ancestral stock from which it has 



