PLATE ll-III 



1 — Bolivina sp., size 50 x 88 microns, Recent, Atlantic Ocean. 



2 — Globigerina sp., size 45 x 88 microns, Recent, Atlantic Ocean. 



3 — Rotalia ? sp., size 50 x 65 microns. Recent, Atlantic Ocean. 



4 — Bolivina sp., size 37 x 80 microns, Recent, Atlantic Ocean. 



5 — Ammodiscus turbinatus Cushman, size 1.5 mm., Cretaceous, Trinidad. (Cushman, U.S. 

 Geol. Survey, Prof. Paper 206) (after Cushman and Jarvis) 



6 — Tritaxia jarvisi Cushman, front view, size 1x2 mm., Cretaceous, Trinidad. (Cushman, 

 U.S. Geol. Survey, Prof. Paper 206) 



7 — Quinqueloculina moremani Cushman, size 0.3 x 0.5 mm., Cretaceous, Texas. (Cushman, 

 U.S. Geol. Survey, Prof. Paper 206) 



8 — Robulus navarroensis (Plummer) Cushman var. extruatus Cushman, size 1.6 mm., 

 Cretaceous, Texas. (Cushman, U.S. Geol. Survey, Prof. Paper 206) 



9 — Dentalina gracilis D'Orbigny, size 1.3 mm., Cretaceous, Texas. (Cushman, U.S. Geol. 

 Survey, Prof. Paper 206) 



10 — Gumbelina globocarinata Cushman, size 0.4 mm., Taylor marl, Cretaceous, Texas. 

 (Cushman, U.S. Geol. Survey, Prof. Paper 206) 



11 — Pseudouvigerina seligi (Cushman) Cushman and Todd, size 0.3 mm., Arkadelphia marl; 

 Cretaceous, Arkansas. (Cushman, U.S. Geol. Survey, Prof. Paper 206) 



12 — Bulimina arkadelphiana Cushman and Parker, size 0.7 mm., Arkadelphia marl, Cre- 

 taceous, Arkansas. (Cushman, U.S. Geol. Survey, Prof. Paper 206) 



13 — Globotmncana canaliculata (Reuss) Cushman, size 0.6 mm., Cretaceous, Bavaria. 

 (Cushman, U.S. Geol. Survey, Prof. Paper 206) 



14 — Globorotalia membranacea (Ehrenberg) White, size 0.4 mm., Velasco shale, Cretaceous, 

 Mexico. (Cushman, U.S. Geol. Survey, Prof. Paper 206) 



15 — Camerina striatoreticulata (L. Rutten) Cole, median section, size 4.8 mm., Eocene, 

 Panama. (Cole, U.S. Geol. Survey, Prof. Paper 244) 



16 — Camerina striatoreticulata (L. Rutten) Cole, transverse section, size 2 x 5.6 mm., Upper 

 Eocene or Lower Oligocene, Panama. (Cole, U.S. Geol. Survey, Prof. Paper 244) 



17 — Lepidocyclina (Lepidocyclina) canallei Lemoine and R. Douville, equatorial section, size 

 3 mm., Oligocene, Panama. (Cole, U.S. Geol. Survey, Prof. Paper 244) 



18 — Lepidocyclina {Lepidocyclina) canallei Lemoine and R. Douville, transverse section, 

 size 1 x 2.6 mm., Oligocene, Panama. (Cole, U.S. Geol. Survey, Prof. Paper 244) 



19 — Asterocyclina minima (Cushman) Cole, equatorial section, size 2.5 mm., Eocene, Panama. 

 (Cole, U.S. Geol. Survey, Prof. Paper 244) 



20 — Asterocyclina minima (Cushman) Cole, vertical section, size 1x2 mm., Upper Eocene, 

 Cuba. (Cole, U.S. Geol. Survey, Prof. Paper 244) 



21 — Paraschwagerina yabei (Staff) Thompson, axial section, size 6 x 9.5 mm., Permian, 

 Sicily. (Thompson, Univ. Kan. Paleont. Contrib. No. 4) 



22 — Paraschwagerina yabei (Staff) Thompson, sagittal section, size 6.5 mm., Permian, 

 Sicily. (Thompson, Univ. Kan. Paleont. Contrib. No. 4) 



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