PLATE LXIX. 



Cristellaria. 



Diam. Page 



Figures 1-4. — Cristellaria articulata, Reuss, . . x 20 547 



Wild-growing forms, abundant off Nightingale Island, 

 Tristan d'Acunlia. 



,, 5. — Cristellaria, sp., . . . x 35 



Young specimen, possibly of Cristellaria deform/is, 

 Eeuss, or some similar variety. 



„ 6,7. — Cristellaria convergent, Bornemann, . . . 546 



Fig. 6. Lateral aspect, . . . x 40 



Fig. 7. a, Lateral aspect ; b, front peripheral aspect, . x 50 



,, 8, 9. — Cristellaria gibba, d'Orbigny, . . x 25 546 



Figs 8a, 9. Lateral aspect ; b, front peripheral aspect. 



,, 10-12. — Cristellaria articulata, Reuss, . . . . 547 



Fig. 10. a, Lateral aspect; b, front peripheral aspect, . x 16 



Fig. 1 1 a, 12. Lateral aspect ; b, front peripheral aspect, x 35 



,, 13. — Cristellaria rotulata, Lamarck, sp., . . x 12 547 



a, Lateral aspect ; b, front peripheral aspect. 



,, 1 4-16.— Cristellaria vortex, Fichtel and Moll, sp., . x 30 548 



Figs. 14a, 15. Lateral aspect; figs, lib, 16, front 

 peripheral aspect. 



,, 17. — Cristellaria orbicularis, d'Orbigny, sp., . x 30 549 



Lateral aspect 



