﻿PLATE IV. 



Figs. 1 — 4. Valvulina pal#:otrochus {Ehrenbery). (Page 83.) 



Fig. 1, a superior, b peripheral, c inferior aspect. Magnified 45 diameters. 



Fig. 2. Adherent specimen. X 45 diam. 



Fig. 3. Transparent perpendicular section. X 40 diam. 



Fig. 4. Horizontal section near the middle of the test. X 40 diam. 



Fig. 5. Valvulina pal^eotrochus, var. compressa, Brady. (Page 85.) 

 a periphero-lateral, b inferior aspect. X 40 diam. 



Figs. 6, 8, 9. Valvulina Youngi, Brady. (Page 86.) 



Fig. 6. a periphero-lateral, b superior aspect. X 45 diam. 

 Fig. 8. Perpendicular section, showing subdivision into chamberlets. X 40 

 diam. 



Fig. 9. Horizontal section near the middle of the test, x 40 diam. 



Fig. 7. Valvulina Youngi, var. contraria, Brady. (Page 87.) 



Fig. 7. a periphero-lateral, b inferior aspect. X 40 diam. 



F'igs. 10, 11. Valvulina plicata, Brady. (Page 88.) 



Fig. 10. a superior, b inferior, c peripheral aspect. X 70 diam. 

 Fig. 11. Young specimen. X 70 diam. 



Figs. 12 — 15. Valvulina bulloides, nov. (Page 89.) 



Fig. 12. a superior, b inferior, c peripheral aspect. Specimen from the 

 Upper Coal-measures of Iowa, U.S.A. X 50 diam. 



Fig. 13. a superior, b inferior aspect. Specimens from the Calcaire de Namur, 

 Belgium. X 100 diam. 



Figs. 14, 15. Horizontal sections of American specimens. X 100 diam. 



