72 



XmiTED STATES NATIONAL MUSEUM BULLETIN 216 



of the road junction of the Elo Claro-Guayaguayare 

 Koad (8% M. P.) and the old Trinidad Central Oilfields 

 Road leading to the abandoned Lizard Springs oilfield, 

 southeast Trinidad (coordinates N:186505 links; 

 E:556755 links), sample Rz. 293 (TLL 50512). 



Remarks: Glohigerina soldadoensis angulosa Bolli, 

 new subspecies, differs from G. soldadoensis Bronnimann 

 in the more angular shape of the chambers. It also 

 has a more restricted stratigraphic range. 



Globigerina gravelli Bronnimann 



Plate 16, Figures 1-3 



Globigerina gravelli BBONNIMAN^f, Bull. Amer. Paleontol., vol. 34, 

 No. 143, pp. 12-13, pi. 1, figs. 16-18, 1952. 



Coiling random. Largest diameter of figured hypo- 

 type 0.47 mm. 



Stratigraphic range: Globoroialia rex zone to Glo- 

 horotalia aragonensis zone. Lizard Springs formation. 



Locality: Figured hypotype (USNM P5038) from 

 Ravine Ampelu, Lizard Springs area, about IYa miles 

 southeast of the road junction of the Rio Claro-Guaya- 

 guayare Road (8^^ M. P.) and the old Trinidad Central 

 Oilfields Road leading to the abandoned Lizard Springs 

 oilfield, southeast Trinidad (coordinates N: 186505 

 links E:556755 links), sample Rz. 293 (TLL 50512). 



Remarks: Glohigerina gravelli Bronnimann is closely 

 related to the spinose G. primitiva Finlay-6''. soldadoensis 

 Bronnimann group, from which it is distinguished by 

 its larger size and greater number of chambers in the 

 final whorl. 



Globigerina collactea (Finlay) 

 Plate 15, Figures 21-23 



Globorotalia collactea Finlay, Trans. Proc. Roy. Soc. New Zea- 

 land, vol. 69, p. 37, pi. 29, figs. 164-165, 1939. 



Globigerina collactea (Finlay), Bronnimann, Bull. Amer. Paleon- 

 tol., vol. 34, No. 143, pp. 13-14, pi. 1, figs. 13-15, 1952. 



CoUing random. Largest diameter of figured hypo- 

 type 0.35 mm. 



Stratigraphic range: Globorotalia rex zone to 

 Globorotalia aragonensis zone. Lizard Springs forma- 

 tion, continuing into the Navet formation. 



Locality: Figured hypotjrpe (USNM P5039) from 

 Trinidad Leaseholds, Ltd., well Guayaguayare 159, 

 Trinidad (coordinates N:151361 Imks; E:554095 links), 

 sample from core, 3,707-13 feet (TLL 232994). 



Remarks: Some doubt exists as to the generic posi- 

 tion of this species. Finlay (1939) originally described 

 it as a Globorotalia. Because of the umbilical position 

 of the apertures, Bronnimann (1952) removed it to 

 Globigerina. The apertures of the specimens examined 

 are usually umbilical, though a slight shifting of the 

 aperture of the ultimate chamber towards an extra- 

 umbilical-umbilical position is often noted. 



Globigerina prolata BoUi, new species 



Plate 15, Figuebs 24^26 



Globigerina pseudobulloides Plummer, Bbonnimann (not Plum- 

 mer, 1926) BuU. Amer. Paleontol., vol. 34, No. 143, pp. 

 21-23, pi. 3, figs. 7-9, 1952. 



Shape of test low trochospiral, biconvex. Equatorial 

 periphery elongate, distinctly lobate. Axial periphery 

 rounded. Wall calcareous, perforate, surface smooth. 

 Chambers inflated globular to slightly compressed; 

 about 12, arranged in 2K whorls, the 4-5 chambers of 

 the last whorl increasing rapidly in size. Sutures on 

 spiral side radial or slightly oblique, depressed ; on um- 

 bilical side radial, depressed. Umbilicus fairly wide, 

 open. Apertures distinct arches, interiomarginal, um- 

 bilical; in some specimens the aperture of the last cham- 

 ber tends to become extraumbilical-uinbilical in posi- 

 tion. Coiling in two-thirds of the specimens counted 

 in the Globorotalia aragonensis zone, sinistral. Largest 

 diameter of holotype 0.40 mm. 



Stratigraphic range: Globorotalia formosa formosa 

 and Globorotalia aragonensis zones. Lizard Springs for- 

 mation; continuing into the Navet formation. 



Locality: Holotype (USNM P5040) from Ravine 

 Ampelu, Lizard Springs area, about IJ^ mile southeast 

 of the road junction of the Rio Claro — Guayaguayare 

 Road (8% M.P.) and the old Truiidad Central Oilfields 

 Road leading to the abandoned Lizard Springs oilfield, 

 southeast Trinidad (coordinates N: 186505 links; 

 E: 556755 links), sample Rz. 281 (TLL 50314). 



Remarks: Globigerina prolata BoUi, new species, 

 probably branched off from G. collactea Finlay in the 

 Globorotalia rex zone. It became fairly common in the 

 Globorotalia formosa formosa and Globorotalia aragonensis 

 zones. Bronnimann (1952) figured and described this 

 species as Globigerina pseudobulloides Plummer. Be- 

 cause of the interiomarginal, extraumbUical-umbilical 

 position of its apertures, pseudobulloides is now placed 

 in Globorotalia. Globigerina prolata differs from Globo- 

 rotalia pseudobulloides in the umbilical position of the 

 apertures, absence of a flaring lip in the last chamber, 

 and more trochospiral arrangement of the chambers. 

 Also it has a distinctly different stratigraphic range. 

 Globorotalia pseudobulloides is restricted to the Paleo- 

 cene (Globorotalia trinidadensis to the Globorotalia 

 pusilla pusilla zones) and Globigerina prolata to the 

 lower Eocene {Globorotalia rex to the Globorotalia 

 aragonensis zones). 



Globigerina taroubaensis Bronnimann 

 Plate 15, Figures 1-2 



Globigerina taroubaensis Bronnimann, Bull. Amer. Paleontol., 

 vol. 34, No. 143, pp. 18-19, pi. 2, figs. 16-18, 1952. 



Largest diameter of figured hypotype 0.27 mm. 



Stratigaphic range: Globorotalia aragonensis zone. 

 Lizard Springs formation, continuing into the Navet 

 formation. 



