74 



UNITED STATES NATIONAL MUSEUM BULLETIN 215 



species is morphologically closely related to Globoro- 

 talia trinidadensis BoUi, new species, from which it 

 differs in having fewer chambers in the final whorl. 



Globorotalia uncinata Bolli, new species 

 Plate 17, Pigitres 13-15 



Shape of test low trochospiral, spiral side almost 

 flat or slightly convex, umbilical side distinctly convex; 

 equatorial periphery distinctly lobate; axial periphery 

 rounded to subangular. WaU calcareous, perforate, 

 surface finely spinose. Chambers subangular, inflated, 

 laterally compressed; 12-15, arranged in about 2% 

 whorls, the 5-6 chambers of the last whorl increasing 

 moderately in size. Sutures on spiral side strongly 

 curved, depressed; on umbilical side radial, depressed. 

 Umbilicus fairly narrow, deep, open. Aperture a low 

 arch; interiomarginal, extraumbilical — umbilical. CoU- 

 ing random. Largest diameter of holotype 0.35 mm. 



Stratigkaphic bange: Globorotalia uncinata zone 

 to Globorotalia pusilla pusilla zone, Lizard Springs 

 formation. 



Locality: Holotype (USNM P5048) from west 

 side of railway track, south of the Pointe-a-Pierre 

 Railway Station, about 500 feet from the level crossing 

 of Station Eoad, Pointe-a-Pierre, Trinidad (coordinates 

 N:259200 links; E:362900 links), sample K.E. 23575 

 (TLL 178894). 



Remarks: Globorotalia uncinata BoUi, new species, 

 differs from the related G. pseudobuUoides (Plummer) 

 in having subangular, laterally distinctly truncated 

 chambers and more strongly cmved sutures on the 

 spiral side. An intermediate specimen is shown on 

 plate 17, figures 16-18 (USNM P5075). Globorotalia 

 uncinata is regarded as the ancester of Globorotalia 

 angulata (White). A transitional form between these 

 two species is shown on plate 17, figures 10-12 (USNM 

 P5074). 



Globorotalia angulata (Wliite) 



Plate 17, Figures 7-9 



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

 pp. 191-92, pi. 27, figs. 13a-c, 1928. 



Shape of test very low trochospiral, spiral side almost 

 flat, umbUical side distinctly convex; equatorial pe- 

 riphery distinctly lobate; axial periphery acute, orna- 

 mented with minute spines in well preserved specimens. 

 Wall calcareous, perforate, finely spinose, especially 

 the imibUical side. Chambers angular, inflated; 12-15, 

 arranged in 2)^3 whorls, the 5 chambers of the last 

 whorl increasing rapidly in size. Sutures on spiral side 

 strongly curved, slightly depressed; on umbilical side 

 radial, strongly depressed. Umbilicus narrow, deep, 

 open. Aperture a narrow slit; interiomarginal, extra- 

 umbilical — umbilical. CoUing random. Largest di- 

 ameter of figured hypotype 0.41 mm. 



Stratigbaphic range: Upper part of Globorotalia 

 uncinata zone to Globorotalia -pusilla pusilla zone. 



Locality: Figured hypotype (USNM P5049) from 

 Trinidad Leaseholds, Ltd., weU Guayaguayare 159, 



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

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



Remarks: Globorotalia angulata (White) differs from 

 the ancestral G. uncinata Bolli, new species, in having 

 subangular chambers and an acute periphery. G. 

 angulata is regarded as the ancestor of G. aegua Cushman 

 and Renz. It is further closely related to G. angulata 

 abundocamerata Bolli, new subspecies. 



Globorotalia angulata abundocamerata Belli, new subspecies 

 Plate 17, Figtjbes 4-6 



Shape of test very low trochospiral, spiral side almost 

 flat, inner whorl occasionally slightly raised; umbilical 

 side strongly convex; equatorial periphery slightly 

 lobate, almost circular; axial periphery subacute to 

 acute without distinct keel, WaU calcareous, perforate, 

 surface finely spinose. Chambers subangular, inflated; 

 14-18, arranged in 2-2K whorls, the 6-7 chambers of 

 the last whorl increasing slowly in size. Sutures on 

 spiral side curved, slightly depressed; on umbilical side 

 radial, depressed. Umbilicus narrow, deep, open. 

 Aperture a narrow slit; interiomarginal, extraumbili- 

 cal — ^umbilical. Coiling random. Largest diameter of 

 holotype 0.4 mm. 



Stratigraphic range: Globorotalia pusilla pusilla 

 zone to lower part of Globorotalia pseudomenardii zone. 

 Lizard Springs formation. 



Locality: Holotype (USNM P5050) from Trmidad 

 Leaseholds, Ltd., well Guayaguayare 159, Trinidad 

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

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



Remarks: 6. angulata abundocamerata Bolli, new 

 subspecies, is a multichambered form of G. angulata 

 (White) with a slightly different stratigraphic range. 



Globorotalia aequa Cushman and Renz 

 Plate 17, Figures 1-3; Plate 18, Kigubes 13-15 



Globorotalia crassata var. aequa Cushman and Renz, Contr. 

 Cushman Lab. Foram. Res., vol. 18, p. 12, pi. 3, figs. 3a-o, 

 1942. 



Globorotalia lacerti Cushman and Renz, Cushman Lab. Foram. 

 Res., Spec. Publ. 18, p. 47, pi. 8, figs. 11, 12, 1946. 



Shape of test. Very low trochospiral, spiral side flat 

 to slightly convex, umbilical side strongly convex; equa- 

 torial periphery lobate; axial periphery acute, faint keel 

 ornamented with spines occasionally observed. Wall 

 calcareous, perforate, surface covered with fine spines 

 in well preserved specimens. Chambers angidar, in- 

 flated; about 10-12, arranged in 2^ whorls; the 3-4 

 chambers of the last whorl increase rapidly in size. 

 The last chamber may represent almost 50 percent of 

 the surface of the test. Sutures on spiral side strongly 

 curved, slightly depressed; on umbilical side radial, 

 distinctly depressed. Umbilicus narrow, deep, open. 

 Aperture a low arch; interiomarginal, extraumbilical- 

 umbilical. Coiling over 90 percent dextral. Largest 

 diameter of figured hypotypes 0.40 mm. 



Stratigraphic range: Globorotalia pseudomenardii 

 zone to Globorotalia rex zone. Lizard Springs formation. 



