PLATE VIII. 



Orthophragmina crassa Cushman (p. 42). 



Figure 1. Vertical section, X 20, showing general thick form, equatorial band, large number of lateral chambers, 



and the pillars. 

 Figure 2. Vertical section of larger specimen, X 20. Both specimens from Cuba (U. S. G. S. station 6122). 



Orthophragmina sculpturata Cushman (p. 43). 



Figure 3. Exterior view showing the few pillars of the central portion and reticulate peripheral portion, X 5. 



Cuba (U. S. G. S. station 3478). 

 Figure 4. Slightly oblique section, X 20. Gloria mine, Oriente Province, Cuba. The black of the chamber 



cavities is due to infiltrated manganese in this and the specimen of figure 7. 

 Figure 5. Vertical section showing heavy pillars, X 20. Cuba (U. S. G. S. station 3478). 

 Figure 6. Oblique section showing the large pillars, each surrounded by a single series of small lateral chambers, 



X 20. Cuba (U. S. G. S. station 3478). 

 Figure 7. Vertical section, X 20, probably of megalospheric specimen, showing the structures shown in figure 6 



but at right angles, the elongate large pillars, and vertical rows of lateral chambers (in black). Same 



locality as figure 4, 



Orthophragmina hayesi Cushman, n. sp. (p. 43). 



Figures 8, 9. Exterior views of two specimens, X 20, showing the deep pits of thecentral region and the reticulate 

 pattern over the remainder of the surface. These and the following from the Brito formation 

 (Eocene) of Nicaragua. 



Figure 10. Vertical sections showing the peripheral flange as developed in adult specimens, X 20. 



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