38 



UNITED STATES NATIONAL MUSEUM BULLETIN 215 



(Cushman Coll. 64183, 64184, 64186, and 64187) from 

 the Lengua formation, Glohorotalia menardii zone, 

 Naparima area; paratypes (Cushman CoU. 64185) from 

 the Lengua formation, Glohorotalia mayeri zone, Napar- 

 ima area; and paratypes (Cushman Coll. 64188) from 

 the Ijengua formation, Glohorotalia zone, Cats Hill area. 

 All the above from Triuidad, B. W. I. Figirred hypo- 

 type (USNM P3914) and unfigured hypotypes (USNM 

 P3915) from the Kecent, Challenger Station 8, lat. 

 28°03'15" N., long. 17°27' W., at a depth of 620 

 fathoms. 



Range: Miocene to Recent. 



Genus Globigerinoita Bronnimann, 1952 



Plate 8, Figures 3a-d 



Globigerinoita Bronnimann, Contr. Cushman Found. Foram. 

 Res., vol. 3, pt. 1 p. 26, 1952. 



Type species: Glohigerinoita morugaensis Bronni- 

 mann, 1952. Fixed by original designation and 

 monotypy. 



Test free, trochospiral; chambers spherical to ovate; 

 sutures depressed, radial to curved; wall calcareous, 

 perforate, radial in structure, surface spinose; primary 

 aperture umbilical in position, with one or more 

 secondary sutural apertures as in Glohigerinoides on the 

 spiral side, in the adult stage the primary apertiu-e is 

 covered by an umbilical bulla and the secondary 

 apertures of the spiral side may also be covered by 

 sutural bullae, with commonly two to three accessory 

 infralaminal apertures at the margins of each of the 

 bullae. 



Remarks: Glohigerinoita diflFers from Glohigerinita 

 Bronnimann iu having the secondary spiral Glohi- 

 gerinoides apertures and in having two or more bullae, 

 one over the primary umbOical aperture and others 

 covering the secondary sutural apertures of the spiral 

 side. Glohigerinoita differs from Glohigerinatheka Bron- 

 nimann in having a Glohigerinoides stage, followed by 

 the development of one or more bullae covering the 

 primary and secondary apertures. In Glohigerinatheka 

 the primary aperture is covered by an enveloping final 

 chamber as in Orhulina, and the bullae cover only the 

 secondary apertures. 



Types and occurrence: Holotype (USNM P3913) 

 and figured and unfigured paratypes (USNM P3212) 

 from the Miocene Lengua formation, Glohorotalia 

 menardii zone, Moruga area, Trinidad, B. W. I. 



Range: Miocene. 



Genus Globigerinatheka Bronnimann, 1952 



Plate 7, Figures 12a-c 



Globigerinatheka Bronnimann, Contr. Cushman Found. Foram. 

 Res., vol. 3, pt. 1, p. 27, 1952. 



Type species: Globigerinatheka barri Bronnimann, 

 1952. Fixed by original designation and monotypy. 



Test free, globular, early chambers trochospiral as in 

 Glohigerina, later with a large enveloping final chamber 

 covering the previous umbilical side as in Orhulina; 



sutures depressed, radial; wall calcareous, perforate, 

 radial in structiu-e; primary aperture of the early Glohi- 

 gerina stage interiomarginal, umbihcal, but this is 

 covered in the adult by the final enveloping chamber, 

 the secondary sutural apertm'es multiple on the spiral 

 side and covered by small bullae, each of which have 

 one or more small arched infralaminal accessory aper- 

 tures. 



Remarks : Glohigerinatheka has a stage like Glohigerap- 

 sis, new genus, preceding the development of bullae, 

 whereas Glohigerinita Bronnimann has a Glohigerina 

 stage followed by the development of a very irregular 

 umbUical-sutural bulla. 



Globigerinoita Bronnimann has an early Glohigeri- 

 noides stage with one or more sutural secondary aper- 

 tures on the spiral side, with bullae covering both the 

 primary and secondary apertures. 



Types and occurrence : Holotype of Glohigerina- 

 theka harri Bronnimann (USNM P3919) and paratypes 

 (USNM P3213) from the Eocene Mount Moriah for- 

 mation. Harmony Hall Well 2, core 10, 11, 1,176-88 

 feet, 1,198-1,212 feet, Trinidad, B. W. I. Figured 

 hypotype (USNM P3922) from the Eocene Navet for- 

 mation (Penitence Hill marl), block in the Oligocene 

 Nariva formation, Pointe-a-Pierre, Trinidad, B. W. I. 



Range: Middle to upper Eocene. 



Genus Globigerinatella Cushman and Stainforth, 1945 



Plate 8, Figures 4r-7c 



Globigerinatella Cushman and Stainforth, Cushman Lab. 

 Foram. Res., Spec. Publ. 14, p. 68, 1945. 



Type species: Globigerinatella insueta Cushman and 

 Stainforth, 1945. Fixed by original designation and 

 monotypy. 



Test free, subglobular, early portion trochospiral 

 with the final chamber usually embracing; wall cal- 

 careous, perforate, radial in structtire, surface smooth 

 or pitted; aperture in the early stage interiomarginal, 

 umbilical, in the later chambers with secondary sutural 

 and areal apertures, surrounded by distinct lips, with 

 small knobby pustulelike bullae covering the areal 

 secondary apertures, or more irregular spreading su- 

 tural bullae covering the secondary sutural apertm'es, 

 all bullae may have infralaminal accessory apertures. 



Remarks: Bronnimann (1950b, p. 80) discussed and 

 illustrated in considerable detail the ontogenetic de- 

 velopment of Globigerinatella, leaving little to be added, 

 other than a mention of the wall structure. He did 

 include, with question, one "aberrant" form which he 

 later referred to the genus Glohigerinita (1951b, p. 16). 

 The latter genus does not have a stage with multiple 

 areal apertures, and does not have an enveloping final 

 chamber. 



Hofker (1954, p. 151) stated of Globigerinatella: 

 "Walls in pdlarized light granular, not radiate as in 

 Glohigerina." He also stated that specimens from 

 Ecuador showed "reduced toothplates very similar to 

 those found in Candeina nitida d'Orbigny." 



The wall structm-e was rechecked for this study and 



