PLATE X. 



Orthophragmina georgiana Cushman (p. 45). 



Figure 1. Surface view of type specimen, X 8. Ocala limestone of Georgia (U. S. G. S. station 73 18). 



Orthophragmina subtaramellei Cushman (p. 45). 



Figures 2, 3. Surface views X 20, Boston manganese mine, Santiago Pro\'ince, Cuba (U. S. G. S. station 6120). 



Orthophragmina antillea Cushman (p. 46). 



Figure 4. Surface view of type specimen, X 5. St. Jean Bay, St. Bartholomew, Leeward Islands (U. S. G. S. 



station 6895). 

 Figure 5. Portion of vertical section, X 20. Same locality as figure 4. 



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