PLATE XXXVII. 



Thurammina. — Cyclammina. 



Figure 1. — Thurammina compressa, Brady, 



a, Lateral aspect ; b, peripheral aspect. 



Diani. Page 



x 50 324 



2-7. — Thurammina albicans. Brady, .... 323 



Figs. 2-5. Lateral aspect, . . ■ . x 50 



Fig. 6. Specimen laid open, to show the thickness of the 



walls and the character of the internal cavity, . x 



Fig. 7. Section of the test, showing its minute structure, . x 



50 

 100 



,, 8-16. — Cyclammina cancellata, Brady, .... 351 



Figs. 8a, 9a, 10. Lateral aspect; figs. 8 6, 9 6, 11, peri- 

 pheral aspect, . . ■ . x 1 5 



Figs. 12, 13. Specimens laid open horizontally to show the 



internal structure, . . • . x 15 



Fig. 14. Horizontal section of the test viewed by trans- 

 mitted light, . . • x 15 



Fig. 15. Part of a specimen laid open transversely, . x 15 



Fig. 16. Exterior with a portion of the imperforate coating 

 scraped away, showing the tubulated structure imme- 

 diately beneath, ... x 30 



17 19. — Cyclammina orbicularis, Brady, . . . x 15 353 



Fig. 17. Specimen laid open transversely showing the 



internal structure. 

 Figs. 18 a, 19. Lateral aspect ; 18 b, peripheral aspect. 



„ 20-23. — Cyclammina pusilla, Brady, .... 353 



Figs. 20 a, 21. Lateral aspect; 20 6, peripheral aspect, . x 15 



Fig. 22. Specimen laid open horizontally to show the 



interior, . . • • . x 15 



Fig. 23. Portion of the same more highly magnified, . x 30 



