STUDIES IN FORAMINIFERA 



73 



Locality: Figured hypotype (USNM P5041) from 

 outcrop on the east side of the Pointe-a-Pierre Road 

 behind a dwelling some 60 feet from the north end of 

 the bridge across the Vista Bella River, San Fernando, 

 Trmidad (coordinates N: 238700 links;E: 363090 links), 

 sample Bo. 112 (TLL 137688). 



Globigerina turgida Finlay 

 Plate 15, Figures 3-5 



Globigerina turgida Finlat, Trans. Proc. Roy. Soc. New Zealand, 

 vol. 69, p. 125, 1939. — Bronnimann, Bull. Amer. Paleontol., 

 vol. 34, No. 143, pp. 19-21, pi. 3, figs. 1-3, 1952. 



Largest diameter of figured hypotype 0.43 mm. 



Stratigraphic range : Globorotalia aragonensis zone, 

 Lizard Springs formation, continuing into the Navet 

 formation. 



Locality: Figured hypotype (USNM P5042) from 

 outcrop on the east side of the Point e-a-Pierre Road 

 behind a dwelling some 60 feet from the north end of 

 the bridge across the Vista Bella River, San Fernando, 

 Trinidad (coordinates N: 238700 links; E: 363090 links), 

 sample Bo. 112 (TLL 137688). 



Family Globorotaliidae Cushman, 1927 



Geaus Globorotalia Cushman, 1927 



Globorotalia pseudobulloides (Plummer) 



Plate 17, Figures 19-21 



Globigerina pseudobulloides Plummer, Univ. Texas Bull. 2644, 



pp. 133-134, pi. 8, figs. 9a-c, 1926. 

 Globigerina cretacea d'Orbigny, White, Journ. Paleontol., 



vol. 2, No. 3, pp. 193-194, pi. 27, figs. 15a-b, 1928. 



Shape of test very low trochospiral, biconvex, 

 moderately compressed. Equatorial periphery lobate. 

 A-xial periphery rounded. Wall calcareous, perforate, 

 surface smooth. Chambers moderately compressed; 

 12-15, arranged in 2-2 K whorls. The 5 chambers of 

 the last whorl increase fairly rapidly in size. Sutures 

 on spiral side curved, less so in the last chambers, 

 depressed; on umbilical side radial, depressed. Um- 

 bilicus fairly narrow, open. Aperture a low arch with 

 a lip; interiomarginal, extraumbilical-umbihcal. Coil- 

 ing random in the Globorotalia trinidadensis and 

 Globorotalia uncinata zones. A preference for dextral 

 coiling (up to 75 percent) develops in the Globorotalia 

 pusilla pusilla zone. Largest diameter of figured 

 hypotype 0.35 mm. 



Stratigraphic range: Globorotalia trinidadensis 

 zone to Globorotalia pusilla pusilla zone. Lizard Springs 

 formation. 



Locality: Figured hypotype (USNM P5043) from 

 Trinidad Leaseholds, Ltd., well Guayaguayare 159, 

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

 sample from core 4,524-36 feet (TLL 232705). 



Remarks: Because of the interiomarginal, extra- 

 umbilical-umbihcal position of the aperture, pseudo- 

 bulloides is removed from Globigerina to Globorotalia. 

 The Globigerina pseudobulloides described and figured 

 by Bronnimann (1952) from the upper Lizard Springs 



is not identical with Plummer's form, but belongs to 

 Globigerina prolata Bolli, new species. 



Globorotalia trinidadensis Bolli, new species 

 Plate 16, Figures 19-23 



Shape of test very low trochospiral, inflated; equa- 

 torial periphery lobate; axial periphery rounded. 

 Wall calcareous, perforate, surface smooth, in early 

 chambers often sUghtly rugose. Chambers globular; 

 14-18, arranged in 2-2)2 whorls, the 5-7 chambers of 

 the last whorl increasing slowly in size. Sutures on 

 spiral side radial, depressed; on umbilical side radial, 

 depressed. Umbilicus fairly wide, open. Aperture a 

 low arch, with a thin, liplike flap in well preserved 

 specimens; interiomarginal, extraumbQical-umbilical. 

 Coiling random. Largest diameters of figured types 

 0.40-0.43 mm. 



Stratigraphic range: Globigerina trinidadensis 

 zone to Globorotalia uncinata zone. Lizard Springs 

 formation. 



Locality: Holotype (USNM P5044) and paratypes 

 (USNM P5045 and P5046) from Trinidad Petroleum 

 Development well Moruga 3, Trinidad (coordinates 

 N: 143522 links; E:504382 links), sample from core 

 10,259-10,261 feet (TLL 192632). 



Remarks: Globorotalia trinidadensis Bolli, new spe- 

 cies, differs from G. pseudobulloides (Plummer) in its 

 larger size and in having more chambers in the final 

 whorl. Early chambers often show a rugose surface. 



Globorotalia quadrata (White) 

 Plate 17, Figures 22-24 



Globigerina quadrata White, Journ. Paleontol, vol. 2, No. 3, 

 p. 195, pi. 27, figs. 18a-b, 1928. 



Shape of test very low trochospiral, spiral side com- 

 monly slightly concave, umbilical side inflated; equa- 

 torial periphery lobate, quadrangular; axial periphery 

 rounded. Wall calcareous, perforate, surface smooth, 

 early chambers finely cancellate. Chambers inflated, 

 globular to slightly compressed laterally; about 10-12, 

 arranged in 2K whorls, the 4-5 chambers of last whorl 

 increasing rapidly in size ; ultimate chamber commonly 

 slightly smaller than penultimate. Sutures on spiral 

 side radial, depressed; on umbilical side: radial, de- 

 pressed. Umbilicus fairly \vide, open. Aperture a 

 low arch; interiomarginal, extraumbilical— -umbilical. 

 Coiling random. Largest diameter of figured hypotype 

 0.42 mm. 



Stratigraphic range: Globorotalia uncinata zone 

 to Globorotalia pseudomenardii zone, Lizard Springs 

 formation. 



Locality: Figured hypotype (USNM P5047) from 

 Trinidad Leaseholds, Ltd., well Guayaguayare 159, 

 Trinidad (coordinates N:151361 links; E554095 links), 

 sample from core 4,524-36 feet (TLL 232705). 



Remarks: Because of the interiomarginal, extra- 

 umbilical — umbilical position of the aperture, quadrata 

 is removed from Globigerina to Globorotalia. The 



