IN THE ESNA-IDFU REGION, NILE VALLEY, EGYPT 183 



guished from the present subspecies by its triglobular test and strongly inflated last 

 chamber, characteristic of typical G. triloculinoides Plummer. 



HOLOTYPE. P. 45587. 



Paratypes. P.45588. 



Horizon and locality. Holo- and paratypes, from sample No. 53, Gebel 

 Owaina section. 



Stratigraphical range. Globigerina triloculinoides parva appears as a rare form 

 in the Upper Danian G. compressa/G. daubjergensis Zone and continues as a common 

 form throughout the Middle and Upper Paleocene. It reaches its acme in the upper 

 part of the G. velascoensis Zone, and then fades out gradually, dying out completely 

 at the top of this zone. As the Lower and Middle Danian are missing in the sections 

 studied, it is not known whether this subspecies accompanies the central form in the 

 Lower and Middle Danian or not. 



Globigerina velascoensis Cushman 

 (PL 16, figs. 3a-d) 



1925 Globigerina velascoensis Cushman : 19, pi. 3, figs. 6a-c. 



19266 Globigerina velascoensis Cushman ; Cushman : 605, pi. 20, fig. 21. 



1928 Globigerina velascoensis Cushman ; White : 196, pi. 28, figs. 2a, b. 



1953 Acarinina triplex Subbotina : 230, pi. 23, figs, -za-c, i,a-c only. 



19576 Globigerina velascoensis Cushman ; Bolli : 71, pi. 15, figs. 9-1 1. 



? 19606 Globigerina velascoensis Cushman ; Bolli & Cita : 14-15, pi. 32, figs. 8a-c. 



1962 Globigerina velascoensis Cushman ; Hillebrandt : 120-121, pi. 11, figs. 4a, 6. 



Description. Test medium sized, coiled in a low trochospire, moderately 

 inflated, more so on the ventral than on the dorsal side ; equatorial periphery 

 roughly ovoid, distinctly lobate ; axial periphery rounded with the last chamber 

 slightly compressed laterally ; chambers on the dorsal side about 11, tightly arranged 

 in 2\ sinistrally coiled whorls, increasing moderately in size in the early part and very 

 rapidly later ; the proloculus appears to be relatively large, globular, inflated, and is 

 followed by crescentic chambers which become roughly quadrangular, and elongate 

 towards the beginning of the final whorl ; the last whorl is composed of 3 J, roughly 

 ovoid, angular chambers, with fairly straight inner margins and distinctly curved 

 outer ones ; the last chamber constitutes about \ of the test ; on the ventral side the 

 chambers are 3|, roughly globular, strongly inflated and increase very rapidly in 

 size ; sutures on the dorsal side curved, depressed in the early part, almost straight 

 and depressed later ; on the ventral side they are almost straight, radial and strongly 

 depressed ; the spiral suture is curved, depressed in the early part, straight, angular 

 (rectispiral) and strongly depressed later ; umbilicus small, narrow and open ; 

 aperture interiomarginal umbilical, a long narrow slit with a delicate apertural lip of 

 which remnants are still preserved ; wall calcareous, perforate ; surface delicately 

 pitted. 



