PLATE XXVI 



M 



Heteiocentrotus mammiUatus, /. i, 2. 



1. Long-headed, long-stemmed interambulacral pedicellaria. 



2. Profile of prong of pedicellaria older than Fig. 1. 



Arbacia punctulata, f. 3~7. 



3. Long-stemmed pedicellaria. 



4. Short-stemmed pedicellaria. 



5. Single prong of Fig. 3, in profile. 



6, 7. Rudimentary spines in bare interambulacral space. 



Iichiuometra viridis, f.S- 10. 



8. Interior of prong of stout, short-stemmed actinal pedicellaria. 



9. Profile of long-headed, long-stemmed interambulacral pedicellaria. 



10. Interior of prong of open-headed, long-stemmed interambulacral pedicellaria. 



Iicbinometra subangularis, /. 11 - 13. 



11. Young, long-headed, long-stemmed pedicellaria. 



12. Interior view of prong of pedicellaria older than Fig. 11. 



13. Interior view of prong of pedicellaria still older than Fig. 12. 



Heterocentrotus trigonarius, /. H. 



14. Open-headed, long-stemmed pedicellaria, single prong. 



I!cbinarachnius parma, /. 15 - 18. 



15, 16, 17, 18. Difierent attitudes of various bifid marginal pedicellaria. 



Echinocardium mediterraneum, /. 19. 



19. Interior of prong of open-headed actinal pedicellaria. 



Breynia Australasiae, /. 20. 



20. Interior of prong of long-stemmed actinal pedicellaria. 



Maretia planulata, /. 21, 22. 

 21, 22. Interior and profile of prong of long-stemmed pedicellaria. 



Spatangus Raschi, /. 23. 



23. Interior of large-headed, short-stemmed pedicellaria. 



Spatangus purpureus, /. 2i - 27. 



24. Large-headed actinal pedicellaria. 



25. Interior of prong of Fig. 24. 



26, 27. Prong of long-headed, long-stemmed pedicellaria. 



Meoma nigra, /. 2S - 30, 37. 



28, 29. E.\terior and profile of stout-headed pedicellaria. 

 30. Interior of long-headed, long-stemmed pedicellaria. 

 37. Large stout-headed pedicellaria. 



