STUDIES IN FORAMINIFERA 



71 



Remarks: Globigerina linaperta Finlay is probably 

 a descendant of 0. triloculinoides Plummer from which 

 it is distinguished by its larger size and less distinct 

 flaring lip protecting the aperture. 



Globigerina triangularis White 

 Platk 15, Figures 12-14 



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



pp. 195-196, pi. 28, figs, la-b, 1928. 

 Globigerina hornibrooki Bronnimann, Bull. Amer. Paleontol., 



vol. 34, No. 143, p. 15, pi. 2, figs. 4-6, 1952. 



Coiling random. Largest diameter of figured hypo- 

 type 0.46 mm. 



Stratigraphic range: Globorotalia pusilla pusilla 

 zone to Globorotalia aragonensis zone, Lizard Springs 

 formation, possibly continuing into the Navet forma- 

 tion. 



Locality: Figured hypo type (USNM P5033) from 

 Trinidad Leaseholds, Ltd., well Guayaguayare 159, 

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

 sample from core 4,434-46 feet (TLL 233005). 



Remarks: Globigerina triangularis White apparently 

 developed from G. triloculinoides Plummer, from which 

 it is distinguished by the more trochospiral arrangement 

 of its chambers and by the smaller relative size of the 

 final chamber. 



Globigerina velascoensig Cushman 



Plate 15, Figures 9-11 



Globigerina velascoensis Cushman, Contr. Cushman Lab. Foram. 

 Res., vol. 1, pt. 1, p. 19, pi. 3, fig. 6, 1925.— White, Journ. 

 Paleontol., vol. 2, No. 3, p. 196, pi. 28, figs. 2a-b, 1928. 



Shape of test low trochospiral, spiral side often 

 slightly concave, umbilical side strongly inflated; 

 equatorial periphery strongly lobate; a.xial periphery 

 roimded. Wall calcareous, perforate, surface smooth. 

 Chambers inflated, subglobular, slightly compressed 

 laterally, about 10, arranged in 2% whorls, the 4 cham- 

 bers of the last whorl increasing rapidly in size. Sutures 

 on spiral side oblique, depressed; on umbilical side 

 radial, depressed. Umbilicus narrow, partly covered 

 by the lip of the last chamber. Apertures low arches, 

 with distinct lips; interiomarginal, umbilical; the 

 aperture of the ultimate chamber often tends to an 

 extraumbilical-umbilical position. CoUing random. 

 Largest diameter of figiu-ed hypotype 0.33 mm. 



Stratigraphic range: Globorotalia pseudomenardii 

 zone to Globorotalia velascoensis zone, Lizard Springs 

 formation. 



Locality: Figured hypotype (USNM P5034) from 

 Trinidad Leaseholds, Ltd., well Guayaguayare 159, 

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

 sample from core 4,324-30 feet (TLL 233004). 



Remarks: Globigerina velascoensis Cushman ap- 

 parently developed from G. triangularis White, from 

 which it is distinguished by having the chambers of 

 the last whorl slightly compressed laterally. Cushman's 

 holotype of G. velascoensis is a poorly preserved and 

 somewhat deformed specimen. The Lizard Springs 

 types compare well with those of White (1928). 



Globigerina primitiva Finlay 



Plate 15, Figures 6-8 



Globigerina primiliva Finlat, New Zealand Journ. Sci. Tech., 

 vol. 28, No. 5, p. 291, pi. 8, figs. 129-134, 1947.— Bronni- 

 mann, Bull. Amer. Paleontol., vol. 34, No. 143, pp. 11-12, 

 pi. 1, figs. 10-12, 1952. 



Coiling random. Largest diameter of figured hypo- 

 type 0.37 mm. 



Stratigraphic range: Globorotalia pseudomenardii 

 zone to Globorotalia aragonensis zone. Lizard Springs 

 formation, continues into the Navet formation. 



Locality: Figured hypotype (USNM P5035) from 

 Trinidad Leaseholds, Ltd., well Guayaguayare 159, 

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

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



Remarks: Globigerina primitiva Fmlay probably 

 developed from G. velascoensis Cushman, from which 

 it is distinguished mainly by its spinose surface. 



Globigerina soldadoensis Bronnimann 



Plate 16, Figures 7-12 



Globigerina soldadoensis Bronnimann, Bull. Amer. Paleontol., 

 vol. 34, No. 143, pp. 9-11, pi. 1, figs. 1-9, 1952. 



Coiling random. Largest diameter of figured hypo- 

 type 0.55 mm. 



Stratigraphic r.4Nge: Globorotalia velascoensis zone 

 to Globorotalia aragonensis zone. Lizard Springs forma- 

 tion, continuing into the Navet formation. 



Locality: Figured hypotype (USNM P5036) from 

 Ravine Ampelu, Lizard Springs area, about Iji miles 

 southeast of the road junction of the Rfo 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: Globigerina soldadoensis Bronnimann is 

 closely related to G. primitiva Finlay, from which it is 

 distinguished mainly by its larger size and greater 

 number of chambers in the final whorl. 



Globigerina soldadoensis angulosa Bolli, new subspecies 

 Plate 16, Figures 4-6 



Shape of test low trochospiral, spiral side slightly con- 

 vex to flat, umbilical side strongly inflated; equatorial 

 periphery distinctly lobate; axial periphery subangular. 

 Wall calcareous, perforate, distinctly spinose. Cham- 

 bers subangular, inflated; about 12, arranged in 2% 

 whorls, the 5 chambers of the last whorl increasing 

 fairly rapidly in size. Sutures on spiral side obUque, 

 depressed; on umbilical side radial, depressed. Umbili- 

 cus medium sized, open. Apertures low arches; 

 interiomarginal-umbilical. Coiling random. Largest 

 diameter of holot3^pe 0.57 mm. 



Stratigraphic range : Globorotalia formosa formosa 

 zone to Globorotalia aragonensis zone. 



Locality: Holotype (USNM P5037) from Ravine 

 Ampelu, Lizard Springs area, about 1% mile southeast 



