Plate 8. ORBULINIDAK: CA7^A1\SYDRACINAE 



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Figures la-2c. Cilobigrrinita naparimarnsis Bronni- 37 

 mann 



la, Spiral side of holotype (Cushmaa Coll. 

 64182). lb, Umbilical side, showing two in- 

 fralaminal accessory apertures at the edge of the 

 transparent bulla, which is similar in appearance 

 and position to a normal chamber, but overlaps 

 the earlier umbilicus, covering the primary um- 

 bilical aperture of the neanic stage, which can 

 be seen through the semitransparent bulla. Ic, 

 Edge view, showing accessory apertures. From 

 the Miocene Lengua formation of Trinidad, 

 B.W.I. 2a, Spiral side of hypotype (USNM 

 P3914), showing sutural extensions of bulla and 

 infralaminal accessory apertures. 2b, Umbilical 

 side, showing well developed umbilical-sutural 

 bulla, with numerous infralaminal apertures along 

 all margins of the bulla. 2c, Edge view. From 

 the Recent Atlantic. Figs. la-c,Xl90; figs. 

 2a-c, X 140. 



Figures 3a-c. Cilobigerinoita morugaensis Bronni- 38 

 mann 



3a, Spiral side of holotype (USNM P3913), 

 showing spiral supplementary sutural apertures, 

 as in Globigerinoides. 3b, Umbilical side, showing 

 umbilical bulla as in Catapsydrax. 3c, d, Edge 



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 view, of opposite edges, showing bullae o\cr the 

 secondary sutural apertures, typical of (Jlobi- 

 gerinoita. From the Miocene Lengua formation 

 of Trinidad, B.W.I. yl50. 

 Figures 4-7c. Clobigfrinau-Ilci insurta Cushman and 38 

 Stainforth 



4, Dissected topotype (USNM P3932a), show- 

 ing areal aperture as in Orbulina, covered by the 

 bulla which has been partially removed, with 

 infralaminal accessory openings visible at the 

 lower margin of the remaining part of the bulla. 

 5a, Spiral side of paratype (Cushman Coll. 

 44043a), showing early trochospiral stage. 5b, 

 Edge view, showing enveloping final chamber 

 and areal and sutural bullae. 6, Umbilical view 

 of topotype (USNM P3932b), showing sutural 

 secondary apertures of Orbulina stage, and the 

 sutural bullae with infralaminal apertures charac- 

 teristic of Globigerinatella. 7a, Spiral side of 

 paratype (Cushman Coll. 44043b). 7b, Um- 

 bilical side, showing embracing Orbulina-Wke. 

 final chamber, with small areal bullae at lower 

 margin. 7c, Edge view, showing elongated 

 sutural bullae and rounded areal bullae. From 

 the Oligocene-Miocene Cipero formation, Trini- 

 dad, B.W.I. Figs. 4-6, X 110; fig. 7, X 105. 



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