PLATE XXX. 



Page 



Figs. 1-6. Ctenodiscus australis, Liitken, . . . . 172 



Fig. 1. Abactiual aspect; magnified 2 diameters. 



Fig. 2. Actiual aspect ; magnified 2 diameters. 



Fig. 3. Profile view ; magnified 2 diameters. 



Fig. 4. A portion of the abactiual surface ; magnified 12 diameters. 



Fig. 5. Adambulacral plates and the adjacent portion of the actinal surface ; 

 magnified 12 diameters. 



Fig. 6. The extremity of a ray ; magnified. 



Figs. 7-12. Ctenodiscus procurator, n. sp. . . .173 



Fig. 7. Abactinal aspect ; magnified 2 diameters. 



Fig. 8. Actinal aspect ; magnified 2 diameters. 



Fig. 9. A portion of the abactiual surface; magnified 16 diameters. 



Fig. 10. Adambulacral plates and the adjacent- portion of the actinal surface; 



magnified 8 diameters. 

 Fig. 11. Abactinal aspect of a young example; natural size. 

 Fig. 12. Mouth-plates ; magnified. 



