Plate 6. ORBULINIDAE : GLOBIGERININAE, ORBULININAE 



FiGURliS 1-5. Sphacroidinilla drhiscius (Parker and 32 

 Jones) 



1, Dissected hypotypc (I'SKM P4225a), show- 

 ing neanic Globigerina stage with umbilical aper- 

 ture and coarsely perforate wall. 2a, Side view 

 of paratype (USNM P4-22-lra), showing thickened 

 heavy wall of ephebic stage, and solid chamber 

 flanges extending over the apertural area. 2b, 

 Edge view. 3a^b, Views of paratypes (USNM 

 P4224b, c). 5, Edge view of hypotype (USNM 

 P-l:225b), showing rare development of a supple- 

 mentary bulla across the apertural groove be- 

 tween chamber flanges. Figs. 1, 5 from the 

 Recent of the Atlantic, figs 2— i from the type 

 locality in the Recent Pacific. All X SO. 



Figures 6a-c. Globigerapsis kugleri Bolli, Loeblich, 34 

 and Tappan, new genus, new species 



6a, Spiral view of holotype (USNM P4220), 

 showing sutural secondary apertures around the 

 margin of the final chamber. 6b, Umbilical side, 

 showing enveloping final chamber which has com- 

 pletely covered the umbilical area and primary 

 umbilical aperture. 6c, Edge view, showing 

 secondary apertures at margin of final enveloping 

 chamber. From the Eocene Navet formation. 

 Trinidad, B.W.I. >( 95. 



Figures 7a-c. Globigerapsis semiinvoluta (Keijzer) 34 

 7a, Spiral side of hypotype (USNM P3937), 

 showing large secondary apertures at margin of 



Page 

 final chamber. 7b, I'mbilical view. 7c, Edge 

 \icw. l'"rom the Eocene Navet formation of 

 4^inidad, B.WM. >: 95. 



I'lGURics S -9b. Purticulasphaera jnexicana (Cushman) 35 

 8, Dissected hypotype (USNM P3902), show- 

 ing neanic Globigerina stage with coarsely per- 

 forate wall, and very fine elongate spines pre- 

 served on the interior, and suggesting that the 

 living specimen was also spinose. 9a, Spiral view 

 of hypotype (USNM P3901), showing supple- 

 mentary sutural apertures in the early stage, as in 

 Globigerinoides. 9b, Edge view, showing en- 

 veloping final chamber over umbilical region 

 which obscures primary aperture of earlier neanic 

 stage. Numerous sutural secondary apertures 

 occur at lower margin of final chamber. From 

 the Eocene Navet formation of Trinidad, I'.W.L 

 X 60. 



Figures lOa-11. Ga)ideina niiida d'Orhlgny 35 



10a, Spiral view of hypotype (USNM P3924), 

 showing multiple sutural secondary apertures as 

 in Globigerinoides. 10b, Umbilical view, showing 

 sutural secondary apertures and absence of pri- 

 mary umbilical aperture in the adult. lOc, Edge 

 view. 11, Dissected hypotype (USNM P3923), 

 showing neanic Globigerinoides stage with both 

 primary umbilical apertures and secondary 

 sutural apertures. From the Recent of the 

 Atlantic. Figs. lOa-c, X 110; fig. 11, •, 100. 



243 



