120 



tOSriTED STATES NATIONAL MUSEUM BULLETIN 215 



thin but distinct keel. Wall calcareous, very finely 

 perforate, surface smooth. Chambers angular rhom- 

 boid, strongly compressed; 12-15, arranged in about 

 3 whorls, the 4-5 chambers of the last whorl increase 

 fairly rapidly iu size. Sutures on spiral side strongly 

 curved; on umbUical side radial to slightly curved, 

 depressed. UmbUicus small, fairly shallow. Apertmre 

 a low slit; interiomarginal, lunbilical-extraumbUical. 

 Coiling random. Largest diameter of holotype 0.3 mm. 



Stratigraphic range (ia Cipero formation) : Upper 

 part of the Globigerinatella insueta zone to the lower 

 part of the Globorotalia Johsi Johsi zone. 



Locality: Holotype (USNM P5676) from the type 

 locality of the Globorotalia fohsi barisanensis zone, 

 Trinidad, sample Bo 202 (TTOC 193125). 



Remarks: Globorotalia archeomenardii, new species, 

 is distinguished from G. menardii (d'Orbigny) and G. 

 praemenardii Cushman and Stainforth by having a 

 more convex spiral side and in being less lobate. The 

 range iu size of the specimens of the new species is 

 very small in contrast to that of the other two species. 

 TjTjical G. archeomenardii disappear with the first 

 appearance of G. praemenardii. It is probably the 

 ancestor of the G. praemenardii-menardii suite. 



Globorotalia praemenardii Cushman and Stainforth 



Plate 29, Figures 4a-c 



Globorotalia praemenardii Ctjshman and Stainforth, Cushman 

 Lab. Foram. Res., Spec. Publ. 14, p. 70, pi. 13, figs. 14a-c, 

 1945. — Cushman and Bermudbz, Contr. Cushman Lab. 

 Foram. Res., vol. 25, pt. 1, p. 31, pi. 5, figs. 17-19, pi. 6, 

 figs. 1-3. 

 Stratigraphic range (iu Cipero formation) : Globo- 

 rotalia fohsi Johsi zone to Globorotalia fohsi robusta zone. 

 Locality: Figured hypotype (USiSIM P5677) from 

 the type locality of the Globorotalia fohsi fohsi zone, 

 sample Bo 185 (TTOC 153997). 



Globorotalia menardii (d'Orbigny) 

 Plate 29, Figures 6a-10b 



Rotalia menardii d'OEBiGNY, Ann. Sci. Nat., vol. 7, p. 273, 

 module No. 10, 1826. 



Globorotalia menardii (d'Orbigny), Nuttall, Journ. PaleontoL, 

 vol. 6, pp. 29-30, pi. 4, fig. 16, 1932. — Coryell and Rivero, 

 Journ. PaleontoL, vol. 14, p. 336, pi. 42, figs. 34, 35, 1940.— 

 Rbnz, Geol. Soc. Amer. Memoir 32, p. 137, pi. 10, figs. 

 3a-c, 1948. — Cushman and Bermudez, Contr. Cushman 

 Lab. Foram. Res., vol. 25, pt. 1, pp. 29-30, pi. 5, figs. 4r-6, 

 1949. 



Stratigraphic range (in Cipero and Lengua forma- 

 tions): Globorotalia fohsi robusta zone to Globorotalia 

 menardii zone. 



Locality: Figxired hypotypes (USNM P5678a-e) 

 from the type locality of the Globorotalia menardii 

 zone, sample KR 23425 (TTOC 178890). 



Remarks: The considerable variation in size within 



the species is shown on the plate. AU figiu-ed speci- 

 mens are from the same sample. 



Globorotalia scitula (Brady) 



Plate 29, Figures lla-12c 



Pulvinulina scitula Brady, Proc. Roy. Soc. Edinburgh, vol. 11, 

 p. 716, 1884 (figs, in Brady, Rep. Voy. Challenger, Zool., 

 vol. 9, pi. 103, figs. 7a-c, 1884). 



Globorotalia canariensis (d'Orbigny), Cushman and Stainforth, 

 Cushman Lab. Foram. Res., Spec. Publ. 14, p. 70, pi. 13, 

 figs. 12a-b, 1945. — Rbnz, Geol. Soc. Amer., Memoir 32, 

 p. 136, pi. 11, figs. 3a-b, 1948. 



Stratigraphic range (ia Cipero and Lengua for- 

 mations) : Globorotalia fohsi fohsi zone to Globorotalia 

 menardii zone. 



Locality: Figured hypotypes (USNM P5679, P5680) , 

 from the Globorotalia mayeri zone, sample GF 3695 

 (TTOC 3320). 



Remarks: Globorotalia scitula was previously de- 

 scribed from the Cipero formation (Cushman and 

 Stainforth, 1945) as G. canariensis (d'Orbigny). 

 D'Orbigny describes this form {Rotalia canariensis) as 

 elongate-depressed and carinate which brings it close 

 to the G. menardii (d'Orbigny) group. Compared 

 with this group, the equatorial periphery of G. scitula 

 is more circular and the axial periphery is roimded to 

 subangular. The Trinidad specimens are slightly 

 larger than the type which was described from the 

 Faroe Channel. Specimens of the same size as those 

 found in Trinidad are today living predominantly in 

 warm waters. Temperature and other ecological 

 factors probably accoimt for the variation in size. 



Globorotalia lenguaensis Bolli, new species 

 Plate 29, Figures 5a-c 



Shape of test low trochospiral; equatorial periphery 

 almost circular, not or only very slightly lobate; axial 

 periphery angular to subangular, often with a faint 

 keel. Wall calcareous, finely perforate, surface smooth. 

 Chambers strongly compressed; 15-20, arranged in 

 2^-3 whorls; the 6-7 chambers of the last whorl in- 

 crease moderately in size. Sutures on spiral side 

 strongly curved, occasionally slightly depressed; on 

 umbilical side radial to slightly sigmoidal, depressed. 

 Umbilicus very narrow, almost closed. Aperture a low 

 arch often with a lip; interiomarginal, umbilical-extra- 

 umbilical. Coiling apparently random in the Globoro- 

 talia mayeri zone; almost exclusively sinistral in the 

 Globorotalia menardii zone. Largest diameter of holo- 

 type 0.3 mm. 



Stratigraphic range (in Lengua formation): Glo- 

 borotalia mayeri zone to Globorotalia menardii zone. 



Locality: Holotype (USNM P5681) from the type 

 locahty of the Globorotalia menardii zone, Trinidad, 

 sample KR 23425 (TTOC 178890). 



Remarks: Globorotalia lenguaensis, new species, re- 



