PLATE VII. 



Orthophragmina cubensis Cushman (p. 40). 



Figure 1. Rock section showing several specimens, X 20, mostly of the megalospheric form. Pilar mine, Oriente 



Province, Cuba. 

 Figure 2. Vertical section probably of a mierospheric specimen, X 20. Cuba (U. S. G. S. station 3448). 



Orthophragmina minima Cushman (p. 41). 



Figure 3. Vertical section, X 20, showing general outline and numerous very fine chambers. White limestone in 

 river bed above ice plant, Da\dd, Panama (U. S. G. S. station G512). 



Orthophragmina clarki Cushman (p. 41). 



Figure 4. Exterior view of partly grown specimen, X 10. 



Figure 5. Exterior \iew of adult specimen, X 10. Both specimens from the Eocene of California (Meganos group of 

 Clark). 



Orthophragmina pustulata Cushman, n. sp. (p. 42). 



Figure G. Slightly oblique section showing equatorial chambers, pillars, and lateral chambers, X 20. Cuba (U. S. 

 G. S. station 3567). 

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