EXPLANATION OF PLATES I-III 



(All figures magnified 29 diameters) 



PLATE I 



Figure 1. — Biloculina depressa, d'Orbigny. A typical test: a, lateral aspect; 

 b, peripheral aspect. 



Figure 2. — B. depressa, d'Orbigny. A form with irregularly serrated peripheral 

 flange, and approaching Brady's var. serrata. Lateral aspect. 



Figure 3. — B. depressa, d'Orbigny. A variety with narrow peripheral flange and a 

 salient aboral termination. Lateral aspect. 



Figure 4. — B. Icevis, Defrance sp. Lateral aspect. 



Figure 5. — B. sarsi, Schlumberger. a, Lateral aspect ; b, peripheral aspect. 



PLATE II 



Figure 6. — B. elongata, d'Orbigny. Lateral aspect of a well-grown specimen. 



Figure 7. — Miliolina tricarinata, d'Orbigny sp. a, Lateral aspect ; b, oral aspect. 



Figure 8. — Cornuspira involvens, Reuss sp. Lateral aspect. 



Figure 9. — Bulimina seminuda, Terquem. a, Ventral aspect ; b, dorsal aspect. 



Figure 10. — Virgulina schreibersiana, Czjzek. Lateral aspect. 



Figure 11. — V. subsquamosa, Egger. Lateral aspect. 



Figure 12. — Cassidulina oblonga, Reuss. a, Superior lateral aspect ; b, inferior and 

 oral aspect. 



Figure 13. — C. parkeriana, H. B. Brady. Lateral and oral aspect. 



Figure 14. — C. subglobosa, H. B. Brady. Ventral peripheral aspect. 



Figure 15. — Ehrenbergina pupa, d'Orbigny. a, Lateral aspect ; b, dorsal aspect. 



Figure 16. — E. serrata, Reuss. A full-grown test ; ventral aspect. 



Figure 17. — E. serrata, Reuss. An immature test. 



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