80 UNITED STATES NATIONAL MUSEUM BULLETIN 215 



where it is especially abundant in the Oloborotalia slightly depressed between last chambers of final whorl; 



Jormosa formosa zone. By its shape it might readily be on imibilical side radial, slightly depressed. Umbilicus 



mistaken for the middle Eocene Truncorotaloides rohri narrow, open. Apertmre a low arch; interiomarginal, 



var. mayoensis Bronnimann and Bermudez or for G. extraumbilical — umbilical. Coiling over 90 percent 



topUensis Cushman (which probably is a Truncoro- dextral. Largest diameter of hypotype 0.33 mm. 



taloides). However, 6. quetra lacks the sutural aper- Steatigraphic range: Oloborotalia rex zone to 



tures on the spiral side which are characteristic for Globorotalia aragonensis zone. Lizard Springs forma- 



Truncorotaloides while its stratigraphic range is re- tion; continuing into the Navet formation, 



stricted to the lower Eocene. 6. guetra appears to be Locality: Figured hypotype (USNM P5072) from 



closely related to G. wUeoxensis Cushman and Ponton, Ravine Ampelu, Lizard Springs area, about iM mile 



from which it is distinguished by the distinct angular southeast of the road junction of the Rio Claro — 



shape of its test. Intermediate forms were found in Guayaguayare Road (Sji M.P.) and the old Trinidad 



the Globorotalia rex zone. Central Oilfields Road leading to the abandoned Lizard 



Springs oilfield, southeast Trinidad (coordinates 



Globorotalia broedermanni Cushman and Bermudez N: 186505 links; E:556755 links). Sample Rz. 293 



Plate 19 Figubes 13-16 ^^^^ 50512). 



' Remarks: The origin of Globorotalia broedermanni 



Globorotalia broedermanni Cushman and Bermudez, Contr. Cushman and Bermudez cannot be traced in the 



Cushman Lab. Foram. Res., vol. 25, p. 40, pi. 7, figs. 22-24, Trinidad sections. The species appears at the base of 



^^*^- the Globorotalia rex zone apparently fully developed and 



Shape of test biconvex, low trochospiral, moderately with a strong preference for dextral coiling (indicating 



compressed; equatorial periphery nearly circular; axial an advanced evolutionary stage). A marked faimistic 



periphery rounded to subangular. Wall calcareous, change between the Globorotalia rex zone and the older 



perforate, surface covered with short spines. Cham- Globorotalia velascoensis zone indicates a hiatus in the 



bers subangular, inflated; about 12-15, arranged in studied sections. It is in this missing interval that 



2K-3 whorls, the 5-6 chambers of the last whorl in- possible ancestral forms of Globorotalia broedermanni 



creasing slowly in size. Sutures on spiral side curved, have to be sought. 



References 



BoLLi, H. M. 



1960. The direction of coiling in the evolution of some Globorotaliidae. Contr. Cushman Found. 

 Foram. Res., vol. 1, pts. 3-4, pp. 82-89, pi. 15. 



1951. Notes on the direction of coiling of rotalid Foraminifera. Contr. Cushman Found. Foram. 



Res., vol. 2, pt. 4, pp. 139-143. 



1952. Note on the Cretaceous-Tertiary boundary in Trinidad, B.W.I. Journ. Paleontol., vol. 26, 



No. 4, pp. 669-675. 

 1957. The genera Praeglobotruncana, Rotalipora, Globotruncana, and Abathomphalus in the Upper 

 Cretaceous of Trinidad, B.W.I. U. S. Nat. Mus., Bull. 215, pp. 61-60, pis. 12-14. 

 Bronnimann, P. 



1952. Trinidad Paleocene and Lower Eocene Globigerinidae. BuU. Amer. Paleontol., vol. 34, 



No. 143, pp. 1-34, pis. 1-3. 



1953. Note on planktonic Foraminifera from Danian localities of Jutland, Denmark. Eclog. Geol. 



Helvetiae., vol. 45 (1952), No. 2, pp. 339-341. 

 Brotzen, p. 



1948. The Swedish Paleocene and its foraminiferal fauna. Sveriges. Geol. Undersokning, Ser. C, 



No. 493, Irsbok 42, No. 2, pp. 1-140, pis. 1-19, figs. 1-41. 

 Cushman, J. A. 



1951. Paleocene Foraminifera of the Gulf Coastal Region of the United States and adjacent areas. 



U. S. Geol. Surv., Prof. Pap. 232, pp. 1-75, pis. 1-24. 

 Cushman, J. A., and Bermudez, P. J. 



1949. Some Cuban species of Globorotalia. Contr. Cushman Lab. Foram. Res., vol. 25, pp. 26-45, 



pis. 5-8. 

 Cushman, J. A., and Ponton, G. M. 



1932. An Eocene foraminiferal fauna of Wilcox age from Alabama. Contr. Cushman Lab. Foram. 

 Res., vol. 8, pp. 51-72, pis. 7-9. 



