118 



tnSriTED STATES NATIONAL MUSEUM BULLETIN 215 



to the rapid increase in size of the chambers in the last 

 whorl, the spiral side often appears slightly concave. 

 Wall calcareous, perforate, surface finely pitted. 

 Chambers spherical, 10-12, arranged in about 2}^ 

 whorls; the 4-5 chambers of the last whorl increase 

 rapidly in size. Sutures on spiral side radial, depressed ; 

 umbilical side radial, depressed. Umbilicus narrow, 

 deep. Aperture a fairly low arch, a slight rim or lip is 

 only occasionally observed, interiomarginal, umbilical- 

 extraumbilical. Coiling random. Largest diameter of 

 holotype 0.55 mm. 



Stratigkaphic eange (in Cipero formation) : Globo- 

 rotalia opima opima zone. 



Locality: Holotype (USNM P5659) and figured 

 paratype (USNM P5660) from the type section of the 

 Globorotalia opima opima zone, Cipero type section, 

 Trinidad, sample JS 20 (TTOC 193265). 



Remarks: Globorotalia opima opima, new species, 

 new subspecies, is distinguished from G. mayeri Cush- 

 man and EUisor by the greater thickness of the test 

 and in having 4-5 chambers in the last whorl, instead 

 of 5-6. The apertural lip, which is usually present in 

 G. mayeri, is only occasionally seen ia the new sub- 

 species. G. opima opima has a very restricted range 

 whereas G. mayeri can be followed through most of the 

 Cipero formation into the lower Lengua. G. opima 

 opima differs from G. opima nana, new species, new 

 subspecies, by its larger size. It has a more restricted 

 stratigraphic range. 



Globorotalia opima nana Bolli, new species, new subspecies 



Plate 28, Figures 3a-c 



Shape of test very low trochospiral; equatorial 

 periphery slightly lobate, of a somewhat quadrangular 

 aspect in four-chambered specimens; axial periphery 

 roimded. Wall calcareous, perforate, surface finely 

 pitted. Chambers spherical; about 10, arranged in 

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

 increase fairly rapidly in size. Sutures on spiral side 

 radial, depressed; on umbUical side radial, depressed. 

 Umbilicus narrow, deep. Aperture a low arch, a rim 

 or lip is often present; interiomarginal, mnbUical- 

 extraumbdical. Coiling random. Largest diameter of 

 holotype 0.3 mm. 



Stratigraphic range (in Cipero formation): Globi- 

 gerina ampliapertura zone to Globigerina ciperoensis 

 ciperoensis zone. Similar forms occur sparsely in the 

 higher zones of the Cipero formation. 



Locality: Holotype (USNM P5661) from the type 

 section of the Globorotalia opima opima zone, Cipero 

 type section, Trmidad, sample JS 20 (TTOC 193265). 



Remarks: Globorotalia opima nana, new species, 

 new subspecies, is distinguished from G. mayeri Cush- 

 man and EUisor by greater relative thickness of test and 

 by having 4-5 chambers in the last whorl, instead of 5-6. 

 The range of the new subspecies is restricted to the 

 lower part of the Cipero formation, while that of G. 

 mayeri extends into the lower Lengua. G. opima nana 

 differs from G. opima opima, new species, new sub- 



species, by its smaller size. It has a more extended 

 stratigraphic range. 



Globorotalia mayeri Cushman and Ellisor 



Plate 28, Figures 4a-c 



Globorotalia mayeri Cushman and Ellisor, Contr. Cushman 

 Lab. Foram. Res., voL 15, pt. 1, p. 11, pi. 2, figs. 4a-4o, 

 1939. — Bermudbz, Cushman Lab. Foram. Res., Spec. 

 Publ. No. 25, p. 286, pi. 22, figs. 24r-26, 1949. 



Globorotalia {Turborotalia) mayeri Cushman and Ellisor, Cush- 

 man and Bermudbz, Contr. Cushman Lab. Foram. Res., 

 vol. 25, pt. 1, p. 44, pi. 8, figs. 16-18, 1949. 



Globorotalia of. mayeri Cushman and Ellisor, Palmer, Mem. 

 Soc. Cubana Hist. Nat., vol. 14, No. 1, p. 292, pi. 28, figs. 

 5a-c, 1940. 



Stratigraphic range (in Cipero and Lengua forma- 

 tions): Globigerina opima opima zone to Globorotalia 

 mayeri zone. 



Locality: Figured hypotype (USNM P5662) from 

 the Catapsydrax dissimilis zone, sample Bo 267 (TTOC 

 201216). 



Remarks: Globorotalia mayeri has a remarkably long 

 range compared with other Oligocene and Miocene 

 species and subspecies of the genus. A close relation to 

 G. opima nana, new species, new subspecies, is likely 

 and it is also possible that G. Johsi barisanensis Le Roy 

 branches off from this form in the Catapsydrax dis- 

 similis zone. 



Globorotalia kugleri BoUi, new species 



Plate 28, Figures 5a-6 



Shape of test very low trochospiral; equatorial 

 periphery slightly lobate; axial periphery rounded or 

 with a tendency to become subangular. WaU calcar- 

 eous, perforate, surface finely pitted. Chambers ovate; 

 18-20, arranged in 2^-3 whorls; the 6-8 chambers of 

 the last whorl increase slowly in size. Sutures on 

 spiral side: curved, depressed; on umbilical side radial, 

 depressed. Umbilicus fairly narrow. Aperture a dis- 

 tinct arch, a lip may be present; interiomarginal, 

 umbilical-extraumbilical. Coiling random. Largest 

 diameter of holotype 0.3 mm. 



Stratigraphic range (in Cipero formation) : Globoro- 

 talia kugleri zone. 



Locality: Holotype (USNM P5663) and figured 

 paratype (USNM P5664) from the Globorotalia kugleri 

 zone, type locality area, Trinidad, sample KWB 8672 

 (TTOC 138659). 



Remarks: Globorotalia kugleri, new species, is dis- 

 tinguished from G. Johsi barisanensis Le Roy by having 

 more chambers in the last whorl. G. kugleri became 

 extinct shortly after the first occurrence of 6^. fohsi 

 barisanensvs. 



The species is named for Dr. H. G. Kugler in recogni- 

 tion of his contributions to the geology of Trinidad. 



Globorotalia fohsi Cushman and Ellisor 



Reference is made to Bolli (1950) for species and sub- 

 species descriptions of Globorotalia fohsi and the discus- 

 sion of evolutionary trends. 



