PLATE II. 



Figs. 1 9. CLIMACAMMINA ANTIQUA, Brady. (Page 68.) 



Figs. 1 5. Specimens illustrating general external characters, septation, 

 apertures, &c. Magnified 30 diameters. 



Figs. 6, 7. Casts of terminal chambers of small cylindrical specimens with their 

 general apertures. X 30 diam. 



Fig. 8. Transparent longitudinal section, showing apertures, septa, and general 

 structure. X 30 diam. 



Fig. 9. Portion of the same section, more highly magnified, to show the 

 arenaceous structure of the test and the partial filling of the chambers with 

 cancellated labyrinthic ingrowths. X 200 diam. 



Figs. 10 14. TROCHAMMINA INCERTA (<F Orbigtiy). (Page 71.) 



Figs. 10, a, b. Lateral and periphero-lateral aspects. X 60 diam. 

 Figs. 11, a, b. x 50 diam. 



Figs. 12, 13. Lateral aspect, x 50 diam. 



Fig. 14. Transparent section of test highly magnified, showing its very finely 

 sub-arenaceous structure, x 200 diam. 



Figs. 15 20. TROCHAMMINA CENTEIFUGA, Brady. (Page 74.) 



Figs. 15 18. Lateral aspect, illustrating range of variation in general external 

 features. X 70 diam. 



Fig. 19. Periphero-lateral aspect. X 70 diam. 



Fig. 20. Transparent horizontal section, showing the simple tubular character 

 of the test and the absence of any true septa. X 70 diam. 



