PLATE XXXVI. 



Placopsilina. — Bdelloidina. — Thurammina. 



Diam. Page 



Figures 1-3. — Placopsilina cenomana. d'Orbigny, sp. 3 . . . 315 



Fig. 1, . • • .x 15 



Fig. 2, . . • • . x 30 



Fig. 3, . . . • x 50 



„ 4-6. — Bdelloidina aggregata, Carter, . . . . 319 



Figs. 4, 5. General aspect of the parasitic test, . x 15 



Fig. G. Portion laid open to show the interior, . x 30 



7-18. — Tliuranvmina papillata, Brady, ... 321 



Fig. 7. Globular specimen ; fig. 8, oval specimen, 



Figs. 9, 10. Specimens with tubulated aperture 



Fig. 11. Adherent test, 



Fig. 12. Specimen with an internal chamber, 



Figs. 13, 11. Internal or primordial chambers, outer 



tests removed, .... 

 Fig. 15. Specimen formed of three adherent spheres, . 

 Figs. 16-18. Portions of specimens from different 



localities, mounted in Canada balsam ; showing 



the variability of the test in point of minute 



structure, . . • x 100 



