PLATE LXXXVIII. 



Page 



Figs. 1-5. Hymenaster caenosus, n. sp 504 



Fig. 1. Abactinal aspect ; natural size. 



Fig. 2. Actinal aspect ; natural size. 



Fig. 3. A portion of the supradorsal membrane ; magnified 8 diameters. 



Fig. 4. Mouth-plates ; magnified. 



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

 4 diameters. 



