STUDIES m FORAMINIPEBA 



109 



drax dissimilis zone. This form is here described as a 

 new subspecies, Globigerina ciperoensis angustmmbili- 

 cata. 



Another subspecies, Globigerina ciperoensis angulisu- 

 turalis has been erected for specimens that show deep, 

 angular, U-shaped sutures between the chambers of the 

 last whorl. Transitional forms to G. ciperoensis cipe- 

 roensis are common. The new subspecies appears to be 

 restricted to the Globorotalia opima opima zone and the 

 Globigerina ciperoensis ciperoensis zone. 



Globigerina ciperoensis ciperoensis Bolli 

 Plate 22, Figures lOa-b 



Globigerina ciperoensis Bolli, Contr. Cushman Found. Foram. 

 Res., vol. 5, pt. 1, p. 1, 1954. 



Globigerina concinna Reuss, Nuttall, Journ. Paleontol., vol. 6, 

 No. 1, p. 29, pi. 6, figs. 9-11, 1932.— Franklin, Journ. 

 Paleontol., vol. 18, No. 4, p. 317, pi. 48, fig. 5, 1944. 



Globigerina of. concinna Reuss, Cushman and Stainporth, Cush- 

 man Lab. Foram. Res., Spec. Publ. 14, p. 67, pi. 13, figs, 

 la-b, 1945. — Beckmann, Eclog. Geol. Helvetiae, vol. 46, 

 No. 2, p. 390, pi. 25, fig. 5, 1953. 



Stratigraphic range (in Cipero formation): Globi- 

 gerina ampliapertura zone to Globigerina ciperoensis 

 ciperoensis zone. 



Locality: Figured hypotype (USNM P5607) from 

 the Globorotalia opima opima zone, sample Bo 273 

 (TTOC 201222). 



Remarks: The subspecies Globigerina ciperoensis 

 ciperoensis includes the forms as described originally 

 with a large umbilicus and without the angular, U- 

 shaped sutures of the subspecies angulisuturalis. 



Globigerina ciperoensis angulisuturalis BoUi. new subspecies 



Plate 22, Figures lla-c 



Shape of test very low trochospiral ; equatorial 

 periphery almost circular, lobate, with deep, angular, 

 U-shaped sutures between the chambers; axial peri- 

 phery rounded. Wall calcareous, perforate, sm-face 

 very finely pitted. Chambers spherical; about 10, 

 arranged in 2 to 2}^ whorls; the 5 chambers of the 

 last whorl increase moderately in size. Sutiu-es on 

 spiral side depressed, radial; on umbihcal side depressed, 

 radial. Umbilicus fairly wide. Apertm-e arched; in- 

 teriomarginal, umbilical. Coiling random. Largest 

 diameter of holotype 0.19 mm. 



Stratigraphic range (in Cipero formation): Glo- 

 borotalia opima opima zone to Globigerina ciperoensis 

 ciperoensis zone. 



Locality: Holotype (USNM P5608) from the type 

 section of the Globorotalia opima opima zone, Trinidad, 

 sample Bo 306A (TTOC 215657). 



Remarks: Globigerina ciperoensis angulisuturalis, new 

 subspecies, is distinguished from G. ciperoensis ciperoen- 

 sis by having deep cut, angular, U-shaped sutures. 



Globigerina ciperoensis angiistiumbilicata Bolli, new subspecies 



Plate 22, Figures 12a-13c 

 Shape of test very low trochospiral; equatorial 



periphery distinctly lobate, axial periphery rounded. 

 Wall calcareous, perforate, surface smooth or very 

 finely pitted. Chambers spherical; about 12, arranged 

 in about 2K whorls; the 4-5 chambers of the last whorl 

 increase moderately to fairly rapidly in size. Sutures 

 on spiral side depressed, radial; on umbilical side 

 depressed, radial. Umbilicus small. Aperture a medi- 

 um to low arch; interiomarginal, umbilical, often with 

 a thin lip. CoUing random. Largest diameter of holo- 

 type 0.24 mm. 



Stratigraphic range (in Cipero formation): Glo- 

 bigerina ampliapertura zone to Catapsydrax dissimilis 

 zone. 



Locality: Holotype (USNM P5609) and figured 

 para type (USNM P5610) from the type section of the 

 Globigerina ciperoensis ciperoensis zone, Trinidad, 

 sample Bo 291A (TTOC 215656). 



Remarks: Globigerina ciperoensis angustiumbilicata, 

 new subspecies, is distinguished from G. ciperoensis 

 ciperoensis by having a small imibilicus. The aperture, 

 which is umbilical in position, may in some specimens 

 show a tendency towards an umbilical — extraumbilical 

 position. 



Globigerina rohri Bolli, new species 

 Plate 23, Figures la-4b 



Globigerina venezuelana Hedberg, Beckmann, Eclog. Geol. 

 Helvetiae, vol. 46, No. 2, p. 392, pi. 10, figs. 12-13, 1953. 



Shape of test trochospiral; equatorial periphery 

 slightly lobate; because of the lateral compression of 

 the chambers, the test has a somewhat spherical appear- 

 ance. Wall calcareous, perforate, surface finely pitted. 

 Chambers spherical, those of last whorl laterally com- 

 pressed; about 12, arranged in about 2}^ whorls; the 3 

 or occasionally 4 chambers of the last whorl increase 

 very rapidly in size; in large specimens the final cham- 

 ber is commonly reduced in size. Sutures on spiral 

 side curved in early stage, radial or oblique later, 

 depressed; on umbilical side radial, depressed. Um- 

 bilicus small, deep; rugosities or short thick spines are 

 found around the umbilical edge. Aperture arched; 

 interiomarginal, imibilical; because of the almost closed 

 umbilicus not well visible. Coiling random. Largest 

 diameter of holotype 0.73 mm. 



Stratigraphic range (in Cipero formation) : Globi- 

 gerina ampliapertura zone to Catapsydrax dissimilis zone. 



Locality: Holotype (USNM P5611) and figured 

 paratypes (USNM P5612a-c) from the type section of 

 the Globorotalia opima opima zone, Trinidad, sample 

 JS 20 (TTOC 193265). 



Remarks: Globigerina rohri, new species, is distin- 

 guished from G. venezuelana Hedberg by having usually 

 3 instead of 4 chambers in the last whorl, by the rugo- 

 sities or short spines around the umbihcal edge and by 

 having the chambers of the last whorl laterally more 

 compressed. 



The species is named for Dr. K. Rohr in recognition 

 of his geological work in Trinidad. 



