76 UPPER CRETACEOUS-LOWER TERTIARY FORAMINIFERA 



Remarks. G. adamsi sp. nov. is morphologically similar to both G. fornicata 

 fornicata Plummer and G. convexa Sandidge. It is distinguished from the former 

 by its dome-shaped, distinctly spiroconvex test, and from the latter by its less truncate 

 axial periphery, better developed marginal keels, and strongly elongated chambers 

 in the last whorl which overlap more on the ventral side. 



Globotruncana adamsi sp. nov. is believed to have evolved from G. fornicata 

 fornicata Plummer into G. contusa patelliformis Gandolfi, as suggested by the morpho- 

 logical features and stratigraphical ranges of these three forms. It was probably 

 confused in the past with G. fornicata Plummer (e.g. Cita 1948) and with G. calici- 

 formis (de Lapparent) (e.g. Cita 1948, Bolli 1951 and Gandolfi 1955). However, 

 these forms are not included in the synonymy of the present species as they lack the 

 distinctly elongated chambers in the last whorl and were incompletely described by 

 their respective authors. 



This species is named after Dr C. G. Adams of the British Museum (Natural 

 History), London. 



Holotype. P.45511. 



Paratypes. P.45510. 



Horizon and locality. Holo- and paratypes from sample No. 4, Abou Saboun 

 section. 



Stratigraphical range. The species is common to abundant throughout the 

 Lower Maestrichtian G. fornicata Zone and the basal part of the Middle Maestrichtian 

 G. gansseri Zone. It fades out gradually upwards in the section, and dies out comple- 

 tely in the lower part of the latter zone. 



The forms described by Cita (1948) as G. fornicata Plummer and G. caliciformis 

 (de Lapparent) which may possibly belong to the present species, were recorded from 

 the Santonian-Maestrichtian and the Upper Campanian-Maestrichtian of Italy 

 respectively. Similar forms described as G. caliciformis (de Lapparent) by Bolli 

 (1951) and as G. caliciformis caliciformis (de Lapparent) by Gandolfi (1955) were 

 recorded from the Maestrichtian of Trinidad and from what was described as Upper 

 Santonian-Campanian of northeastern Colombia respectively. 



Globotruncana aegyptiaca aegyptiaca Nakkady 

 (PI. 3, figs. 4a-d ; PI. 4, fig. 1) 



1950 Globotruncana aegyptiaca Nakkady : 690, pi. 90, figs. 20-22. 

 ? 1954 Globotruncana aegyptiaca Nakkady ; Nakkady & Osman : 75-76, pi. 20, figs, -zoa-c. 

 1956 Rugotruncana skewesae Bronnimann & Brown : 550-551, pi. 23, figs. 4-6. 



Emended diagnosis. A Globotruncana distinguished by its medium to large- 

 sized, distinctly quadrilobate test ; flat to weakly arched dorsal side and strongly 

 protruding ventral one ; highly lobate equatorial periphery ; two strongly develop- 



