PLATE XI. 



Orthophragmina mariannensis Cushman (p. 46). 



Figure 1. Surface view of si^ecimen, X 4. Ocala limestone of Florida (U. S. G. S. station 6768). 



Orthophragmina mariannensis var. papillata Cushman (p. 47). 



Figure 2. Surface view of specimen, X 6. Ocala limestone of Georgia (U. S. G. S. station 7126). 



Orthophragmina vaughani Cushman (p. 47). 



Figure 3. Surface view of type specimen, X 8. Ocala limestone of Georgia (U. S. G. S. station 3387). 



Orthophragmina americana Cushman (p. 47). 



Figure 4. Surface view of type specimen, X 4. Ocala limestone of Florida (U. S. G. S. station 6768). 

 54 



