STUDIES IN FORAMINirERA 



79 



off from Globigerina velascoensis which has less com- 

 pressed chambers and an imibilical position of the 

 apertures. 



Globorotalia mckannai (White) 



Plate 19, Figures 16-18 



Globigerina mckannai White, Joum. Paleontol., vol. 2, No. 3, 

 p. 194, pi. 27, figs. 16a-c, 1928. 



Shape of test low trochospLral, umbilical side strongly 

 inflated; equatorial periphery nearly circular, slightly 

 lobate; axial periphery roimded. Wall calcareous, 

 perforate, finely spinose. Chambers inflated, slightly 

 compressed laterally; 12-16, arranged in 2-3 whorls, 

 the 5-7 chambers of the last whorl increasing moderately 

 in size. Sutiu-es on spiral side oblique, depressed; on 

 umbUical side, radial, depressed. UmbUicus narrow, 

 open. Apert\u"e a low arch; interiomarginal, extra- 

 umbilical-umbilical. Coiling random. Largest diam- 

 eter of figured hypotype 0.35 mm. 



Stratigraphic range: Upper part of Globorotalia 

 psevdomenardii zone. Lizard Springs formation. 



Locality: Figured hypotype (USNM P5067) from 

 northeast bank of Tank Farm at the old Club Site, 

 Pointe-a-Pierre, Trinidad (coordinates N:256950 links; 

 E:380000 links), sample K. 10832 (TLL 228674). 



Remarks: The species is moved to the genus 

 Globorotalia because of the interiomarginal, extraum- 

 bilical-umbilical position of the aperture. G. mckannai 

 (White) is possibly related to G. tortiva Bolli, new name, 

 from which it is distinguished by having more chambers 

 in the last whorl. 



Globorotalia whitei Weiss 

 Plate 19, Figures 10-12 



Globigerina crassaformis Galloway and Wissler, White, Journ. 



Paleontol., vol. 2, No. 3, p. 193, pi. 27, figs. 14a-c, 1928. 

 Globorotalia whitei Weiss, Journ. Paleontol., vol. 29, No. 1, pp. 



18, 19, pi. 6, figs. 1-3, 1955. 



Shape of test very low trochospiral, umbilical side 

 inflated; equatorial periphery lobate; axial periphery 

 roimded to subacute. Wall calcareous, perforate, 

 finely spinose. Chambers inflated, slightly compressed 

 laterally; about 12, aiTanged in 2-2}^ whorls, the 4-5 

 chambers of the last whorl increasing moderately in size. 

 Sutures on spiral side oblique, depressed; on umbilical 

 side radial, depressed. Umbilicus fairly narrow, open. 

 Aperture a low arch; interiomarginal, extraumbUical- 

 umbUical. Coiling random. Largest diameter of fig- 

 ured hypotype 0.33 mm. 



Stratigraphic range: Globorotalia pseudomenardii 

 to Globorotalia velascoensis zone. Lizard Springs forma- 

 tion. 



Locality: Figured hypotype (USNM P5068) from 

 Trinidad Leaseholds, Ltd., Guayaguayare well 159, 

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

 sample from core 4,212-24 feet (TLL 233002). 



Remarks: Globorotalia whitei Weiss appears to be the 

 ancestor of G. vAlcoxensis Cushman and Ponton. 

 From that species it is distinguished mainly by its 

 smaller size and less acute axial periphery. 



Globorotalia wilcoxensis Cushman and Ponton 



Plate 19, Figures 7-9 



Globorotalia wilcoxensis Cushman and Ponton, Contr. Cushman 

 Lab. Foram. Res., vol. 8, pt. 3, p. 71, pi. 9, figs. lOa-c, 1932. 



Shape of test very low trochospiral, spiral side flat, 

 occasionally slightly concave; umbihcal side strongly 

 convex and inflated; equatorial periphery lobate; axial 

 periphery rounded, in last chambers often becoming 

 acute. Wall calcareous, perforate, distinctly spinose. 

 Chambers inflated, shghtly compressed latcraUy; about 

 10, arranged in 2-2}^ whorls, the 4 chambers of the last 

 whorl increasing rapidly in size, the last chamber often 

 slightly reduced again. Sutures on spiral side oblique, 

 depressed; on umbUical side radial, strongly depressed. 

 Umbihcus narrow, deep, open. Aperture a low arch; 

 interiomarginal, extraumbilical-umbilical. Coiling about 

 85 percent dextral. Largest diameter of hypotype 

 0.48 mm. 



Stratigraphic range: Globorotalia rex zone. Lizard 

 Springs formation. 



Locality: Figured hypotype (USNM P5069) 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: Globorotalia wilcoxensis Cushman and 

 Ponton is regarded as the ancestor of G. quetra Bolli, 

 new species. 



Globorotalia quetra Bolli, new species 

 Plate 19, Figures 1-6 



Shape of test very low trochospu-al, spiral side flat or 

 slightly concave, umbilical side strongly convex, 

 angular; equatorial periphery strongly lobate; axial 

 periphery subacute to acute, a spiny peripheral keel is 

 often present in the early chambers of the last whorl; 

 ultimate and penultimate chambers acute or rounded. 

 Wall calcareous, perforate, distinctly spinose. Cham- 

 bers angular to subangular, inflated; about 12, ar- 

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

 increasing rapidly in size. Sutures on spiral side 

 oblique or curved, depressed; on umbilical side radial, 

 depressed. Umbilicus fairly narrow, deep, open. Aper- 

 ture a low arch; interiomarginal, extraumbilical- 

 umbilical. Coiling over 90 percent dextral in the 

 Globorotalia formosaformosa and Globorotalia aragonensis 

 zones. Largest diameter of holotype 0.64 mm. 

 Largest diameter of figured paratype 0.50 mm. 



Stratigraphic range: Globorotalia rex zone to 

 Globorotalia aragonensis zone. Lizard Springs formation. 



Locality: Holotype (USNM P5070) and figured 

 paratype (USNM P5071) from Ravine Ampelu, Lizard 

 Springs area, about 1% mile southeast of the road 

 jimction of the Rio Claro — Guayaguayare Road (8% 

 M.P.) and the old Trinidad Central Oilfields Road 

 leading to the abandoned Lizard Springs oilfield, south- 

 east Trinidad (coordinates N:186505 links; E:556755 

 Imks), sample Rz. 293 (TLL 50512). 



Remarks: Globorotalia quetra Bolli, new species, is a 

 very characteristic form in the upper Lizard Springs, 



