58 



UNITED STATES NATIONAL MUSEUM BULLETIN 215 



Dimensions of holotype: diameter 0.44 mm.; thick- 

 ness 0.2 mm. 



Range: Olobotruncana inomata zone to Globotruncana 

 concavata zone, Naparima Hill formation. Holotype 

 from Globotruncana renzi zone, Naparima Hill forma- 

 tion. Similar forms seem to extend into the Globotrun- 

 cana fomicata and G. stuarti zones of the Naparima HU] 

 formation. 



Types and occurrence: Figured types from Trini- 

 dad Petroleum Development well Moruga 15, Trinidad 

 (coordinates N:149878 Hnks, E:497002 links). Holo- 

 type (USNM P4800) from core 6,802-6,827 feet (TLL 

 223498), paratype (USNM P4801) from core 6,980- 

 7,005 feet (TLL 223504). 



Remarks: Globotruncana inomata, new species, differs 

 from Globotruncana wilsoni, new species, in having the 

 early chambers of the last whorl roimded at the periph- 

 ery rather than with a double keel. It also has a 

 longer stratigraphic range than Globotruncana wilsoni, 

 new species. 



Globotruncana schneegansi Sigal 



Plate 14, Figtjkes la-c 



Globotruncana schneegansi Sigal, 19th Congr. G6ol. Internat., 

 Monogr. R6g., ser. 1, No. 26, p. 33, fig. 34, 1952. 



Shape of test: low trochospiral, biconvex; equatorial 

 periphery lobate, with distinct single keel on all cham- 

 bers of last whorl. Wall: calcareous, perforate, surface 

 smooth. Chambers: angular, strongly compressed; 

 about 14, arranged in 2)^-3 whorls; the 5 chambers of 

 the last whorl increase rapidly in size, early whorls 

 small by comparison. Sutures: spiral side curved, 

 raised, beaded; umbilical side radial, depressed. Um- 

 bilicus; shallow, wide. Apertures: primary apertures 

 interiomarginal, umbiUcal; tegilla with accessory aper- 

 tures not preserved in examined specimens. Coiling: 

 the limited number of specimens seen coiled dextrally. 



Dimensions of figured hypotype: diameter 0.6 mm.; 

 thickness 0.2 mm. 



Range: Globotruncana inomata zone to Globotrun- 

 cana renzi zone, Naparima HUl formation. 



Type and occurrence: Figm-ed hypotype (USNM 

 P4802) from Trinidad Petroleum Development well 

 Moruga 15, Trinidad (coordinates N:149878 links, 

 E:497002 links), sample from core 6,980-7,005 feet 

 (TLL 223504). 



Globotruncana renzi Gandolfi 



Plate 14, Figures 3a-c 



Globotruncana appenninica-linnei O. Renz, Eclog. Geol. Hel- 



vetiae vol. 29, No. 1, pi. 6, figs. 16-19, 21, and pi. 8, figs. 



2, 3, 5, 1936. 

 Globotruncana renzi Gandolfi, Riv. Italiana Paleontol., Stratigr., 



vol. 48, Suppl. Mem. 4, p. 124, pi. 3, figs, la-c, pi. 



4, figs. 15, 16, 28, 29, 1942.— Hagn and Zeil, Eclog. Geol. 



Helvetiae, vol. 47, No. 1, p. 37, pi. 3, figs. 2a-c, 1954. 



Shape of test: low trochospiral, biconvex; equatorial 

 periphery slightly lobate, with closely spaced double 

 keel in early chambers of last whorl; last and occa- 



sionally penultimate chambers with a single keel only. 

 Wall: calcareous, perforate, surface smooth. Cham- 

 bers : angular, strongly compressed ; about 14, arranged 

 in 2 J^-3 whorls ; the 5 chambers of the last whorl increase 

 rapidly in size, early whorls small by comparison. 

 Sutures: spiral side curved, slightly raised in last whorl, 

 occasionally beaded, in early part depressed; umbilical 

 side depressed, radial or slightly curved. Umbilicus: 

 shallow, wide. Apertures: primary apertiu-es interio- 

 marginal, umbilical; tegilla with accessory apertures not 

 preserved in examined specimens. Coiling: the limited 

 number of specimens seen coiled dextrally. 



Dimensions of figured hypotype: diameter 0.6 mm.; 

 thickness 0.23 mm. 



Range: Globotruncana renzi to Globotruncana con- 

 cavata zone, Naparima Hill formation. 



Type and occurrence: Figured hypotype (USNM 

 P4803) from Trinidad Petroleum Development well 

 Moruga 15, Trinidad (coordinates N: 149878 links, 

 E:497002 links), sample from core 6,802-6,827 feet 

 (TLL 223498). 



Globotnincana cf. lapparenti coronata Bolli 

 Plate 14, Figures 2a-c 



fGlobotruncana lapparenti coronata Bolli, Eclog. Geol. Helvetiae, 

 vol. 37, No. 2, p. 233, pi. 9, figs. 14, 15, and figs. 21 and 22 

 of text fig. 1, 1944. 



fGlobotruncana coronata BoUi, Sigal, 19th Congr. Giol. Internat., 

 Monogr. R6g., ser. 1, No. 26, p. 34, fig. 36, 1952. 



Shape of test: low trochospiral, biconvex; equatorial 

 periphery lobate, with closely spaced double keel. 

 Wall: calcareous, perforate, surface smooth. Cham- 

 bers: angular, strongly compressed; about 14, arranged 

 in 2K-3 whorls; the 5 chambers of the last whorl in- 

 crease rapidly in size; early whorls small by comparison. 

 Sutures: spiral side curved, depressed or slightly raised 

 in ultimate whorl, depressed in early portion; umbilical 

 side sUghtly curved, depressed. Umbihcus: shallow, 

 wide. Apertures: primary apertures interiomarginal, 

 umbilical. TegUla with accessory apertures not pre- 

 served in examined specimens. Coiling: the limited 

 number of specimens seen coiled dextrally. 



Dinaensions of figured specimen: diameter 0.56 nam.; 

 thickness 0.2 mm. 



Range: Globotruncana renzi to Globotruncana con- 

 cavata zone, Naparima Hill formation. 



Type and occurrence: Figured specimen (USNM 

 P4804) from Trinidad Petroleum Development well 

 Moruga 15, Trinidad (coordinates N: 149878 links, 

 E:497002 Unks), sample from core 6,519-6,544 feet 

 (TLL 223495). 



Remarks: The Trinidad specimens are slightly 

 smaller than the typical forms from the Alpine-Medi- 

 terranean region. 



Globotruncana wilsoni Bolli, new species 

 Plate 14, Figures 4a-c 



Shape of test: low trochospiral, biconvex; equatorial 

 periphery lobate, early chambers of last whorl with a 



