PLATE XXX. 
Figs. 1-6. CrENODISCUS AUSTRALIS, Liitken,. . -. . 172 
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. Abactinal aspect ; magnified 2 diameters. 
io. 2. Actinal aspect ; magnified 2 diameters. 
ig. 3. Profile view; magnified 2 diameters. 
ic. 4. A portion of the abactinal surface ; magnified 12 diameters. 
. 5. Adambulacral plates and the adjacent portion of the actinal surface ; 
magnified 12 diameters. 
io, 6. The extremity of a ray ; magnified. 
J oO 
Figs. 7-12. CTENODISCUS PROCURATOR, 0. sp. : : ; 173 
io. 7. Abactinal aspect ; magnified 2 diameters. 
io. 8. Actinal aspect ; magnified 2 diameters. 
ic. 9. A portion of the abactinal surface; magnified 16 diameters. 
ig. 10. Adambulacral plates and the adjacent portion of the actinal surface ; 
magnified 8 diameters. 
ic. 11. Abactinal aspect of a young example ; natural size. 
ig. 12. Mouth-plates ; magnified. 
