STUDIES IN FORAMINIFERA 



111 



mous, with the exception that G. minuta has sutural 

 apertures on the final chamber, which might be a 

 gerontic stage. More detailed work wUl be required 

 to establish possible relationships between Globigerina 

 hradyi and Glohigerinoides minuta on the one hajid and 

 Globigerina juvenilis and G. hradyi on the other. In 

 this connection, possible relationships between G. 

 juvenilis and Globigerinita naparimaensis Bronnimann 

 and between Globigerinoides minuta and Globigerinoita 

 morugaensis Bronnimann should also be studied. 



Globigerina foliata Bolli, new species 

 Plate 24, Figures la-c 



Shape of test low trochospiral ; equatorial periphery 

 strongly lobate. WaU calcareous, perforate, siuface 

 very finely pitted. Chambers spherical; 8 to 10, ar- 

 ranged in about 2 whorls; the 4 chambers of the last 

 whorl increase very rapidly in size. Sutures on spiral 

 side radial, deeply depressed; on umbilical side radial, 

 deeply depressed. Umbilicus fairly small. Aperture 

 a medium to low arch, often with a thin lip; interio- 

 marginal, umbihcal. Coiling random. Largest diam- 

 eter of holotype 0.56 mm. 



Stratigraphic range (in Cipero and Lengua forma- 

 tions): Catapsydrax dissimilis zone to Globorotalia men- 

 ardii zone. 



Locality: Holotype (USNM P5620) from the type 

 section of the Globorotalia fohsi robusta zone, Trinidad, 

 sample JS 16 (TTOC 193261). 



Remarks: Globigerina foliata, new species, is char- 

 acterized by having almost discrete spherical chambers. 

 The sutures between the four chambers of the last 

 whorl are deeply incised. 



Globigerina nepenthes Todd 



Plate 24, Figures 2a-c 



Globigerina nepenthes Todd, U. S. Geol. Survey Prof. Paper 

 280-H, p. 301, pi. 78, fig. 7, 1957. 



Stratigraphic range (in Lengua formation) : Globo- 

 rotalia mayeri zone to Globorotalia menardii zone. 



Locality: Figured hypotype (USNM P5621) from 

 the type locality of the Globorotalia mayeri zone, sample 

 KR 23422 (TTOC 160634). 



Remarks: Globigerina nepenthes is restricted in 

 Trinidad to the upper part of the Globorotalia mayeri 

 zone and to the Globorotalia menardii zone. Although 

 it is found in the transitional beds of the Lengua and 

 Cruse formations and would under more favourable 

 conditions probably have a longer range, it is here an 

 excellent index fossil for the Lengua formation. 



Genus Globoquadrina Finlay, 1947 



Globoquadrina dehiscens (Chapman, Parr, and Collins) 



Plate 24, Figures 3a-4c 



Globorotalia dehiscens Chapman, Parr, and Collins, Linn. See. 

 London, Journ. Zool., vol. 38, No. 262, p. 569, pi. 11, figs. 

 36a-c, 1934. 

 Stratigraphic range (in Cipero and Lengua for- 



mations): Catapsydrax stainjorthi zone to Globorotalia 

 menardii zone. 



Locality: Figured hypotypes (USNM P5622) from 

 the type section of the Globorotalia fohsi lobata zone, 

 sample JS 32 (TTOC 193786) ; (USNM P5623) from the 

 Globorotalia fohsi robusta zone, sample JS 46 (TTOC 

 194056). 



Remarks: Globoquadrina quadraria (Cushman and 

 Applin) and G. quadraria var. advena Bermudez 

 are apparently closely related to G. dehiscens. Although 

 some variation can be observed in the Cipero and 

 Lengua specimens, they are here all placed in G. 

 dehiscens. 



Globoquadrina altispira altispira (Cushman and Jarvis) 



Plate 24, Figures 7a-8b 



Globigerina altispira Cushman and Jarvis, Contr. Cushman 

 Lab. Foram. Res., vol. 12, pt. 1, p. 5, pi. 1, figs. 13a-c, 14, 

 1936. — Coryell and Rivero, Journ. Paleontol., vol. 14, 

 No. 4, p. 339, pi. 42, fig. 32, 1940.— Bermudez, Cushman 

 Lab. Foram. Res., Spec. Publ. 25, p. 277, pi. 21, fig. 43, 1949. 



Stratigraphic range (in Cipero and Lengua forma- 

 tions): Catapsydrax stainforthi zone to Globorotalia Johsi 

 robusta zone. 



Locality: Figured hypotypes (USNM P5624) from 

 the type section of the Globorotalia fohsi lobata zone, 

 sample JS 32 (TTOC 193786); (USNM P5625) from 

 the Globorotalia fohsi robusta zone, sample JS 46 (TTOC 

 194056). 



Remarks: Globoquadrina altispira altispira varies 

 considerably, ranging from small to large specimens 

 and from low to high trochospiral forms. The form 

 described by Cushman and Jarvis is here given sub- 

 species rank. It is distinguished from G. altispira glo- 

 bosa, new subspecies, by having somewhat elongate and 

 laterally compressed chambers. 



Globoquadrina altispira globosa Bolli, new subspecies 

 Plate 24, Figures 9a-10c 



Shape of test medium to high trochospiral ; equatorial 

 periphery distinctly lobate. Wall calcareous, perforate, 

 surface finely pitted, with short spines on well preserved 

 specimens (figs. lOa-c). Chambers spherical to very 

 slightly compressed laterally; 15-20, arranged in 3-4 

 whorls; the 5-6 chambers of the last whorl increase 

 moderately in size. Sutures on spiral side radial, de- 

 pressed; on umbilical side radial, depressed. Umbilicus 

 fairly wide, deep. Aperture high, covered above by an 

 elongate, toothlike flap; interiomarginal, umbilical. 

 Coiling random m the Catapsydrax dissimilis zone, later 

 becommg predominantly sinistral (as is also Globoquad- 

 rina altispira altispira and Globoquadrina dehiscens; 

 BoUi, 1951). Largest diameter of holotype 0.7 mm. 



Stratigraphic range (in Cipero and Lengua forma- 

 tions): Catapsydrax dissimilis zone to Globigerinatella 

 insueta zone and Globorotalia fohsi robusta zone to 

 Globorotalia menardii zone. 



Locality: Holotype (USNM P5626) and figured 

 paratype (USNM P5627) from the type locality of the 



