244 UPPER CRETACEOUS-LOWER TERTIARY FORAMINIFERA 



considered to belong to the Middle Eocene (Lutetian) because of the absence of such 

 typically developed forms as Hantkenina, Truncorotaloides and Globiger apsis, 

 among others ". He also stated that the species population recorded from these 

 strata are indicative of an Upper Paleocene-lowermost Eocene age as recognized 

 elsewhere. On the other hand, Reiss (1957) argued for a Lower-Middle Eocene age 

 for the present subspecies, but as he gave neither figure nor description, it is impos- 

 sible to know what he meant by Truncorotalia aragonensis caucasica. 



In the Esna-Idfu region, G. velascoensis caucasia occurs as a rare form in the 

 lower part of the Upper Paleocene G. velascoensis Zone, the G. pseudomenardii 

 Subzone. 



Globorotalia velascoensis parva Rey 



(PL 20, figs. 4a-d) 



IQ 53 Globorotalia velascoensis (Cushman) ; Hamilton (pars) : 231, pi. 31, figs. 24, 28, 29, 

 non figs. 30, 31 non pi. 30, figs. 16-18. 



1955 Globorotalia velascoensis (Cushman) var. parva Rey : 209, pi. 12, figs. la-b. 



19606 Globorotalia velascoensis parva Rey ; Bolli & Cita : 32-33, pi. 33, figs. 5«-c. 

 ? 1961 Globorotalia (Truncorotalia) acuta Toulmin ; Kiipper : 257, pi. 16, figs. j,a-c. 

 ? 1963 Globorotalia acuta Toulmin ; Aubert : 54-55, pi. 1, figs. },a-c. 



Description. Test large, planoconvex, umbilico-convex, coiled in a very low 

 trochospire ; dorsal side flat ; ventral side distinctly protruding with a high umbilical 

 shoulder and thick, beaded umbilical flange or collar ; equatorial periphery ovoid, 

 distinctly lobate with a well-developed, broad, thick, heavily beaded marginal keel ; 

 axial periphery strongly acute ; chambers on the dorsal side 9, arranged in 2 dextrally 

 coiled whorls, increasing slowly in size in the early part and very rapidly later ; thus 

 the last whorl constitutes most of the test and the last chamber about one-third of it ; 

 the initial chambers are small, indistinct and very weakly raised ; the last whorl is 

 composed of 4 large, typically crescentic chambers ; on the ventral side the chambers 

 are 4, large, angular conical and strongly protruding, with their distal ends much 

 thickened, beaded and surrounding the umbilicus in the form of an umbilical flange 

 or collar ; sutures on the dorsal side curved, raised, much thickened and heavily 

 beaded ; on the ventral side they are radial and strongly depressed ; umbilicus small, 

 very deep, open and crowned with a thick, beaded collar ; aperture a narrow, long 

 arch, interiomarginal, extraumbilical-umbilical ; wall calcareous, perforate ; 

 surface generally smooth with a few scattered papillae, except for the keel, dorsal 

 sutures and umbilical collar, which are heavily papillose. 



Dimensions of described specimen. 

 Maximum diameter = o-6o mm. 

 Minimum diameter = 0-48 mm. 



Thickness = 0-30 mm. 



Remarks. Globorotalia velascoensis parva was first described by Rey (1955) as a 

 variety of G. velascoensis (Cushman). Gartner & Hay (1962) raised this variety 

 to subspecific rank, a step which is strongly supported by this study, although their 

 figures are different from the holotype of Rey and from the present hypotypes. 



