NO. 4 FORAMINIFERA CUSHMAN ']'] 



PLATE i6 



Fig. I. Orbitolites complanata Lamarck. X 30. a, surface view ; h, peripheral 

 view. 



2. Orbiculina compressa d'Orbigny. X 3o. 



3. Orbiculina adunca (Fichtel and MoU). X 30. Showing interior cham- 



ber divisions. 



4. Lepidocyclina macdonaldi Cushman. Vertical section. X 20. 



5. Lepidocyclina canellei Lemoine and Douville. Oblique section. X 20. 



Showing narrow zone of equatorial chambers and two broader 

 zones of lateral chambers. 



6. Orthophragmina minima Cushman. Vertical section. X 20. 



