STUDIES IN FORAMINIFERA 



165 



from its junction, Central Range, Trinidad (coordinates 

 N:3 14300 links ; E :487360 links) ; sample K 9077 (TTOC 

 178166). 



Remarks: According to the generic definition of 

 Glohigerinoides, "Globigerinoides" higginsi, new species, 

 should be included here. This is only done provisionally 

 because no genetic relation is apparent between this 

 lower-middle Eocene form and the main group of Globi- 

 gerinoides species which appears only at the close of the 

 Oligocene or in the early Miocene. More detailed 

 studies on well preserved material might reveal differences 

 that justify a generic separation of "Globigerinoides" 

 higginsi from Globigerinoides. It has been thought that 

 "Globigerinoides" higginsi might possibly be the ancestor 

 of the Globigerapsis group. However, it differs from 

 Globigerapsis index (Finlay), which is the oldest repre- 

 sentative of that genus, in the possession of a large 

 umbilical aperture, higher spire, and more globular 

 chambers. 



Thi'ough the courtesy of Dr. A. R. Loeblich, U. S. 

 National Museum, an excellently preserved specimen 

 from an Eocene core from the Atlantic Ocean was made 

 available to the author (pi. 36, figs, lla-b). It possesses 

 two sutural supplementary apertures, and the surface 

 is covered with very minute spines. It has been chosen 

 as the holotype. 



The species is named for Mr. G. E. Higgins, senior 

 exploration geologist of The Trinidad Oil Compan3^ 



Subfamily Orbulininae Schultze, 1854 



Genus Globigerapsis BoUi, Loeblich and Tappan, 1957 



Globigerapsis index (Finlay) 



Plate 36, Figures 14a-18b 



Globigerinoides index Finlat, Trans. Proc, Roy. Soc. New Zea- 

 land, vol. 69, pt. 1, p. 125, pi. 14, figs. 85-88, 1939. 



Stratigraphic range: Globigerapsis kugleri zone to 

 Globigerapsis semiinvoluta zone, Navet formation; ?Glo- 

 borotalia cocoaensi^ zone, San Fernando formation. 



Locality: Figured hypotypes (figs. 14, 15; USNM 

 P5722a-b) from the Globigerapsis kugleri zone, Navet 

 formation; in small ravine between mileposts 12 K and 

 12)^ of the Brasso-Tamana Road and the Navet River, 

 Central Range (see text-fig. 25); sample HGK 8824 

 (TTOC 177764). Figured hypotypes (figs. 16-18; 

 USNM P5723-5725) from the Porticulasphaera mexicana 

 zone, Navet formation; same locality as given for 

 Hastigerina micra (Cole) (p. 161); sample Hg 8581 

 (TTOC 215782). 



Remarks: Globigerapsis index differs from G. kugleri 

 Bolli, Loeblich, and Tappan in having a smaller final 

 chamber covering the umbUicus and in higher arched 

 sutural supplementary apertures. 



Globigerapsis kugleri BoUi, Loeblich, and Tappan 



Plate 36, Figukes 21a-b 



Globigerapsis kugleri Bolli, Loeblich, and Tappan, U. S. Nat. 

 Mus. Bull. 215, p. 34, pi. 6, figs. 6a-b, 1957. 



Globigerinoides mexicana (Cushman), Beckmann, Eclog. Geol. 

 Helvetiae, vol. 46, No. 2, p. 393, pi. 25, figs. 1.5, 17, 1953. 



Stratigraphic range: Globigerapsis kugleri zone to 

 Porticulasphaera mexicana zone, Navet formation. 



Locality: Figured hypotjrpe (USNM P5727) from 

 the Globorotalia lehneri zone, Navet formation; Nariva 

 River, Central Range; sample K 9071 (TTOC 178160). 



Globigerapsis semiinvoluta (Keijzer) 

 Plate 36, Figures 19-20 



Globigerinoides semiinvolulus Keijzer, Univ. Utrecht Geogr. 



Geol. Med., Phys.-Geol. Reeks, ser. 2, No. 6, p. 206, pi. 4, 



figs. 58:i-e, 1945. 

 Globigerinoides index Finlay, Beckmann, Eclog. Geol. Helvetiae, 



vol. 46, No. 2, p. 392, pi. 25, fig. 14, 1953. 

 Globigerapsis semiinvoluta (Keijzer), Bolli, Loeblich, and 



Tappan, U. S. Nat. Mus. Bull. 215, p. 34, pi. 6, figs. 7a-c, 



1957. 



Str.\tigraphic range: Globigerapsis semiinvoluta 

 zone, Navet formation. 



Locality: Figured hypotypes (USNM P5726a-b) 

 from the type locality of the Globigerapsis semiinvoluta 

 zone, Navet formation (see p. 159) ; sample Ky 7 (TTOC 

 144343). 



Genus Porticulasphaera BoUi, Loeblich and Tappan, 1957 



Porticulasphaera mexicana (Cushman) 



Plate 37, Figures la-b. 



Globigerina mexicana Cushman, Coutr. Cushman Lab. Foram. 



Res., vol. 1, No. 3, p. 6, pi. 1, figs. 8a-b, 1925.— Weiss, 



Micropaleontology, vol. 1, No. 4, p. 309, pi. 2, fig. 15, 1955. 

 Globigerinoides mexicana (Cushman), Beckmann, Eclog. Geol. 



Helvetiae, vol. 46, No. 2, pp. 393-394, pi. 25, fig. 19, 1953. 

 Porticulasphaera mexicana Bolli, Loeblich, and Tappan, U. S. 



Nat. Mus. Bull. 215, p. 35, pi. 6, figs. 8, 9a-b, 1957. 



Stratigraphic range: Porticulasphaera mexicana 

 zone, Navet formation. 



Locality: Figured hypotype (USNM P5728) from 

 the Porticulasphaera mexicana zone, Navet formation; 

 same locality as given for Hastigerina micra (Cole) 

 (p. 161); sample Hg 8581 (TTOC 215782). 



Genus Catapsydrax Bolli, Loeblich, and Tappan, 1957 

 Catapsydrax echinatus BoUi, new species 



Plate 37,. Figures 2a-5b 



Shape of test low to medium trochospiral ; equatorial 

 periphery lobate; axial periphery rounded, more rarely 

 becoming slightly subangular. Wall calcareous, per- 

 forate, surface covered with short, thin spines. Cham- 

 bers spherical or slightly compressed, 10-15 in about 

 2^2 whorls; the last whorl of about 4 chambers increasing 

 faiily rapidly in size. Sutures on spiral side radial or 

 slightly oblique, depressed; on umbilical side radial, 

 depressed. Umbilicus fairly narrow, covered by a 

 bulla. Primary aperture covered by umbilical bulla, 

 interiomarginal, umbilical; accessory apertures of bulla 

 very small medium to low arches, one or two in number, 

 occasionally more, infralaminal, situated above sutures 

 between earlier chambers. Coiling in over 90 percent 



