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PLATE XXVII. 
Page 
Figs. 1-4. PoRCELLANASTER CRASSUS, 0. sp... : ft lal 
. 1. A portion of the abactinal surface ; magnified 20 diameters. 
ig. 2. Mouth-plates ; magnified 5 diameters. 
ig. 83. Adambulacral plates, with segmental pits and papille ; magnified 10 
diameters. 
. 4. A cribriform organ ; magnified 6 diameters. 
[For macroscopic figures of this species see Pl. XXII. figs. 4-7. ] 
Figs. 5-8. PoRCELLANASTER GRACILIS, n. sp. . c . aes 
io. 5. A portion of the abactinal surface ; magnified 15 diameters. 
io. 6. Mouth-plates ; magnified 10 diameters. 
ig. 7. Adambulacral plates, with segmental pits and papille; magnified 18 
diameters. 
ig. 8. A cribriform organ; magnified 15 diameters. 
[ For macroscopic figures of this species see P]. XXII. figs. 1-3. ] 
Figs. 9-12. PoRCELLANASTER CAULIFER, D. sp. . : fy RLS 
g. 9. A portion of the abactinal surface ; magnified 20 diameters. 
g. 10. Mouth-plates ; magnified 10 diameters. 
g. 11. Adambulacral plates ; magnified 15 diameters. 
g. 12. A cribriform organ ; magnified 12 diameters. 
[For macroscopic figures of this species see Pl. XXI. figs. 5-10. ] 
Figs. 13-16. PoRCELLANASTER TUBEROSUS, 0. sp. . ; » 140 
ig. 13. A portion of the abactinal surface ; magnified 20 diameters. 
ig. 14. Mouth-plates ; magnified 8 diameters. 
ig. 15. Adambulacral plates ; magnified 16 diameters. 
ig. 16. A cribriform organ ; magnified 9 diameters. 
[For macroscopic figures of this species see Pl. XXIII. figs. 1-4.] 
Figs. 17-20. SryRACASTER HORRIDUS, n. sp... : «| Pag 
17. A portion of the abactinal surface ; magnified 20 diameters. 
18. Mouth-plates ; magnified 4 diameters. 
19. Adambulacral plates ; magnified 8 diameters. 
20. A cribriform organ; maenified 5 diameters. 
| For macroscopic figures of this species see Pl. XXIII. figs. 5-7.] 
