PLATE LXXXVII. 



Page 

 Figs. 1-3. Hymenaster nobilis, Wyville Thomson, . . 495 



Fig. 1. Abactinal aspect ; natural size. 



Fig. 2. Actinal aspect ; natural size. 



Fig. 3. Adambulacral plates and adjacent portion of the actinal surface; magnified 

 3 diameters. 



Figs. 4-7. Hymenaster infernalis, n. sp. 508 



Fig. 4. Abactinal aspect ; natural size. 



Fig. 5. A portion of the supradorsal membrane ; magnified 15 diameters. 

 Fig. 6. Mouth-plates ; magnified. 



Fig. 7. Adambulacral plates and adjacent portion of the actinal surface; magnified 

 10 diameters. 



