PLATE LXXXIII. 
Pa 
Figs. 1-3. HYMENASTER PERGAMENTACEUS, D. sp. . s : ie 
Fig. 1. A portion of the supradorsal membrane ; magnified 10 diameters. 
Fig. 2. Mouth-plates; magnified, 
Fig. 3. Adambulacral plates and adjacent portion of the actinal surface ; magnified 
7 diameters. 
[For macroscopic figures of this species see Pl]. LXXXI. figs. 1, 2.] 
Figs. 4-6. HYMENASTER FORMOSUS, 0. sp. : | Ae 
Fig. 4. A portion of the supradorsal membrane; magnified 16 diameters. 
Fig. 5. Mouth-plates ; magnified. 
Fig. 6. Adambulacral plates and adjacent portion of the actinal surface ; magnified 
15 diameters. 
[For macroscopic figures of this species see Pl. LX XXL. figs. 3, 4.] 
Figs. 7-9. HYMENASTER ECHINULATUS, DL. sp... : « ) 902 
Fig. 7. A portion of the supradorsal membrane ; magnified 15 diameters. 
Fig. 8. Mouth-plates; magnified. 
Fig. 9. Adambulacral plates and adjacent portion of the actinal surface; magnified 
16 diameters. 
[For macroscopic figures of this species see Pl. LXXXII. figs. 1, 2.] 
Figs. 10-12. HyMENASTER POROSISSIMUS, n. sp. . - a ods 
Fig. 10. A portion of the supradorsal membrane ; magnified 10 diameters. 
Fig. 11. Mouth-plates; magnified. 
Fig, 12. Adambulacral plates and adjacent portion of the actinal surface ; magnified 
8 diameters. 
[For macroscopic figures of this species see Pl, LXXXIIL. figs. 3, 4.] 
