70 



tnsriTED STATES NATIONAL' MTTSETJM BTTLLETDSr 216 



rotalia they vary from globular to strongly compressed 

 and may have a peripheral keel. In a number of 

 species with globular chambers, described in this paper, 

 it became difficult to decide whether the position of the 

 last aperture was truly umbilical or was to some degree 

 extraumbUical — imibUical. Such transitional positions 

 make it difficult to decide whether a species belongs to 

 Olohigerina or Globorotalia and the decision remains 

 rather arbitrary. 



The determination of the majority of the previously 

 established Glohigerina and CHohorotalia species is based 

 on a direct comparison of the Lizard Springs fauna with 

 type material. The holotypes of the species erected 

 by Bronnimann, Cushman and coauthors, Nuttall, 

 Weiss and White were available to the author. Co- 

 types of most of the remaining species have been seen. 



Glohigerina finlayi, 6. hornihrooki and O. stainforthi, 

 which were erected by Bronnimann (1952) from the 

 Lizard Springs formation, are omitted from the follow- 

 ing species descriptions. They were found to be either 

 exceedingly scarce, or, in the present author's opinion, 

 not sufficiently differentiated from existing species to 

 warrant separation. 6. finlayi is placed in synonymy 

 with G. linaperta Finlay, and G. hornihrooki with G. 

 triangularis White, while G. stainforthi is regarded as 

 close to G. triloculinoides Phimmer. 



Family Orbulinidae Schultze, 1854 



Subfamily Globigerininae Carpenter, 1862 



Genus Glohigerina d'Orbigny, 1826 



Glohigerina daubjergensis Broimimanii 



Plate 16, Figures 13-15 



Glohigerina daubjergensis Bronnimann, Eclog. Geol. Helvetiae, 

 vol. 45 (1952), No. 2, pp. 340-341, fig. 1, 1953. 



Coiling random. Largest diameter of figured hypo- 

 type 0.16 mm. 



Stbatigraphic range: Glohorotalia trinidadensis 

 zone, Lizard Springs formation. 



Locality: Figured hypotype (USNM P5029) from 

 Trinidad Leaseholds, Ltd., -Premier Consolidated Oil- 

 fields, Ltd., well Rochard 1, Trinidad (coordinates 

 N:148191 links; E:392552 Hnks), sample from core 

 8,556-65 feet (TLL 228753). 



Remarks: Glohigerina daubjergensis Bronnimann 

 differs from all other known early Paleocene Glohigerina 

 species in its small size and in the distinctly trochospiral 

 arrangement of the chambers. G. spiraHs BoUi, new 

 species, displays a similar trochospiral coUing but is 

 larger in size and possesses more chambers. 



Glohigerina spiralis Bolli, new species 



Plate 16, Figures 16-18 



Shape of test medium to high trochospiral, biconvex, 

 spiral side distinctly convex, umbiHcal side less so; 

 equatorial periphery lobate; axial periphery rounded. 



WaU calcareous, perforate, surface smooth. Chambers 

 inflated, globular or slightly compressed laterally; about 

 15, arranged in 3 whorls; the 5-6 chambers of the last 

 whorl increase moderately in size. Sutm-es on spiral 

 side radial or slightly curved, depressed; on imibilical 

 side radial, depressed. Umbilicus narrow, open. Aper- 

 tiu-es distinct arches with faint lips, interiomarginal, 

 umbilical; that of last chamber in some specimens tends 

 to an extraumbUical — umbilical position. Coiling ran- 

 dom. Largest diameter of holotype 0.28 mm. 



Stratigraphic range: Glohorotalia uncinata zone, 

 Lizard Springs formation. 



Locality: Holotype (USNM P5030) from west side 

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

 station, about 500 feet from the level crossing of Station 

 Road, Pointe-a-Pierre, Trinidad (coordinates N: 259200 

 links; E:362900 links), sample KR 23575 (TLL 178894). 



Remarks: See remarks imder Glohigerina daubjer- 

 gensis Bronnimann. 



Glohigerina triloculinoides Plununer 



Plate 15, Figures 18-20; and Plate 17, Figures 25-26 



Glohigerina triloculinoides Plummer, Univ. Texas Bull. 2644, 



pp. 134r-135, pi. 8, figs. lOa-c, 1926.— Bronnimann, Bull. 



Amer. Paleontol., vol. 34, No. 143, pp. 24r-25, pi. 3, figs. 



13-18, 1952. 

 Glohigerina pseudotriloha White, Journ. Paleontol., vol. 2, No. 3, 



pp. 194r-195, pi. 27, figs. 17a-b, 1928. 



Coiling random in the Glohorotalia trinidadensis and 

 Glohorotalia uncinata zones, but developing a preference 

 for dextral coiling (up to 85 percent) in the Glohorotalia 

 pusilla pusilla zone. Largest diameter of figured 

 hypotype 0.30 mm. 



Stratigraphic range: Glohorotalia trinidadensis zone 

 to Glohorotalia pusilla pusilla zone, Lizard Springs 

 formation. 



Locality: Figm-ed hypotype (USNM P5031) from 

 Trinidad Leaseholds, Ltd., well Guayaguayare 159, 

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

 sample from core 4,778-90 feet (TLL 232706). 



Glohigerina linaperta Fiulay 



Plate 15, Figures 15-17 



Glohigerina linaperta Finlay, Trans. Proc. Roy. Soe. New Zea- 

 land, vol. 69, p. 125, pi. 13, figs. 54r-57, 1939. — Bronnimann, 

 Bull. Amer. Paleontol., vol. 34, No. 143, pp. 16-17, pi. 2, 

 figs. 7-9, 1952. 



Coiling random from the Glohorotalia pseudomenardii 

 zone to Glohorotalia formosa formosa zone; a slight pref- 

 erence for dextral coiling was noted in the Glohorotalia 

 aragonensis zone. Largest diameter of figured hypo- 

 type 0.42 mm. 



Stratigraphic range: Glohorotalia ehrenbergi zone 

 to Glohorotalia aragonensis zone. Lizard Spriogs forma- 

 tion, continuing into the Navet formation. 



Locality: Figured hypotype (USNM P5032) from 

 Trinidad Leaseholds, Ltd., well Guayaguayare 159, 

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

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



