PLATE II. 



ECHINOIDEA and ASTEROIDEA. 



Figure 1. STRONGYLOCENTROTUS DROBACHIENSIS (O. F. M.), A. Ag. Abactinal aspect, natural size. 



2. The same specimen, seen in profile, natural size. 



3. Portion of test near the ambitus, showing the ambulacral and interambulacral areas, 



magnified. 



4. ASTERACANTHION POLARE, M. & T. Abactinal aspect, reduced one half. 



5. Actinal aspect of the same specimen, reduced one half. 



6. Portion near the middle of a ray, actinal aspect, magnified. 



7. Portion near the middle of a ray, abactinal aspect, magnified. 



8. A similar portion from the more compactly spinulated variety of this species, magnified. 



9. ASTERACANTHION GR<ENLANDICUM (Steenstrup), Lutken. Abactinal aspect, natural size. 



10. Actinal aspect of the same specimen, natural size. 



11. Portion near the middle of a ray, actinal aspect, magnified. 



12. Portion near the middle of a ray, abactinal aspect, magnified. 



13. STICHASTER ALBULUS (Stimps.), Verrill. Abactinal aspect, natural size. 



14. A larger and almost equal-rayed variety from Proven. 



15. Actinal aspect of the same specimen, natural size. 



16. Portion near the middle of a ray, actinal aspect, magnified. 



17. Portion near the middle of a ray, abactinal aspect, magnified. 



18. CRIBRELLA OCULATA (Linck), Forbes. Abactinal aspect, natural size. 



19. Actinal aspect of the same specimen, natural size. 



20. Portion near the middle of a ray, actinal aspect, magnified. 



21. Portion near the middle of a ray, abactinal aspect, magnified. 



22. PEDICELLASTER PAL^EOCRYSTALLUS, Sladen. Abactinal aspect, natural size. 



23. Actinal aspect of the same specimen, natural size. 



24. Portion near the middle of a ray, actinal aspect, magnified. 



25. Portion near the middle of a ray, abactinal aspect, magnified. 



26. One of the pedicellarise, magnified. 



