IN THE ESNA-IDFU REGION, NILE VALLEY, EGYPT 203 



A form with a much rougher surface than the holotype, sub-circular test, and more 

 chambers in the last whorl (PL 22, figs. 6a.-d), may well be a transitional stage 

 between G. velascoensis velascoensis and the present species. This substantiates the 

 hypothesis that G. bollii evolved from G. velascoensis velascoensis in late Paleocene or 

 early Eocene time, as suggested by their morphological features and stratigraphical 

 ranges. 



Subbotina (1953, pi. 18, figs, la-c) figured as G. marginodentata Subbotina, a form 

 with a flat dorsal side, which may belong to G. bollii. 



Loeblich & Tappan (1957a) described as G. rex Martin a form which appears to 

 be different from the holotype of Martin (1943), the hypotype of Mallory (1959), and 

 the present form. 



Holotype. P.45599. 



Paratype. P. 45600. 



Horizon and locality. Holo- and paratype, from sample No. 68, Gebel Owaina 

 section. 



Stratigraphical range. The species is common to rare in the G. wilcoxensis 

 Zone, which is here considered to represent the basal Eocene ; Bolli's form was also 

 recorded from the Lower Eocene of Trinidad. 



Globorotalia compressa (Plummer) 

 (PL 17, figs. ia-3c) 



1926 Globigerina compressa Plummer : 135-136, pi. 8, figs. na-c. 



19376 Globigerina compressa Plummer ; Glaessner : 382, pi. 4, figs. 32a-*;. 



1953 Globigerina compressa Plummer var. compressa Plummer ; Subbotina (pars) : 55, 



pi. 2, figs, la-c ; non figs. 3^-1 4c. 

 1953 Globorotalia membranacea (Ehrenberg) ; Subbotina (pars) : 205, pi. 16, figs, ya-c, 



loa-c ; non figs. 8a-gc, na-i^c. 

 1955 Globorotalia compressa (Plummer) Dalbiez & Glintzboeckel (in Cuvillier et al., 1955) : 



533, pi. 1, figs. sa-c. 

 1957 Globigerina compressa Plummer ; Troelsen : 129, pi. 30, figs. ?ja-c. 

 1957a Globorotalia compressa (Plummer) ; Loeblich & Tappan : 188, pi. 40, figs. $a-c ; pi. 41, 



figs. 5<z-c ; pi. 42, figs. $a-c ; pi. 44, figs, ga-ioc. 

 1960^ Globigerina compressa Plummer ; Hofker : 78-79, text-figs. 35«-c. 

 19606 Globorotalia compressa (Plummer) ; Bolli & Cita : 20-21, pi. 32, figs. $a-c. 

 1962 Globorotalia (Turborotalia) compressa (Plummer) ; Berggren : 94-96, pi. 14, figs. 5«-c, 



text-figs. 13 (1-6). 



Description. (Specimen, PL 17, figs. ia-c). Test small, roughly lenticular, 

 slightly elongate, compressed, coiled in a very low trochospire, nearly equally bi- 

 convex, or slightly more convex on the ventral side ; equatorial periphery roughly 

 ovoid and distinctly lobate ; axial periphery bluntly acute ; 13 chambers on the 

 dorsal side arranged in 2| dextrally coiled whorls ; the initial chambers are extremely 

 small, very weakly inflated, globigerine and increase gradually in size ; the last whorl 

 is composed of 5, relatively large, roughly crescentic chambers which are compressed 

 and increase more rapidly in size ; the 5 chambers on the ventral side are roughly 



