PLATE XI. 



Page 

 Figs. 1-4. Plutonaster bifrons, Wyville Thomson, sp. . 84 



Fig. 1. Abactinal aspect ; magnified 2 diameters. 



Fig. 2. Actinal aspect ; magnified 2 diameters. 



Fig. 3. A young example, abactinal aspect ; magnified 6 diameters. 



Fig. 4. A young example, actinal aspect ; magnified 6 diameters. 



[For magnified details of this species see PI. XIII. figs. 9, 10.] 



Figs. 5, G. Plutonaster ambiguus, n. sp. . . . 95 



Fig. 5. Abactinal aspect ; magnified 3 diameters. 

 Fig. 6. Actinal aspect ; magnified 3 diameters. 



[For magnified details of this species see PL XIII. figs. 11, 12.] 



