PLATE Xir. 



Hchinarachnius parma, f. 1-13. 



1. Young, from above, magnified ^^, elongated Echinometra-like. 



2. The same from actinal side. 



3. The same in profile. 



4. Somewhat older than preceding, from above, \. 



5. Older than fig. 4, from above, ^. 



6. The same as fig. 5, from below, ^. 



7. Rotula of specimen of fig. 4, magnified. 



8. Rotula of specimen of fig. 6, magnified. 



9. Older specimen, first trace of conjugation of pores, from above, \. 



10. Still older than preceding, ambulacra petaloid, from above, 3^3. 



11. Anal plate of anal system, fig. 9. 



12'. Anal plates covering anal system, fig. 10. 



12. Anal plates of specimen measuring 11.5""- in diam. 



13. Young Echinarachnius 15.1""' in diam., having all main features of adult. 



Eacope emarginata, f- 14- 25. 



1 4. Young from above, in Moulinsia stage, ^. 



15. Young from below, in Moulinsia stage, ^*, showing first trace of posterior lunule. 



16. Abactiual part of ambulacrum of fig. 14, somewhat more magnified. 



1 7. Young, posterior lunule seen from above, nat. size. 



18. Part of fig. 17, from actinal side, somewhat magnified. 



19. Part of test of same, from above, still more magnified. 



20. Young Encope, from above, slight indentations, nat. size. 



21. Part of test of same, from actinal side, magnified. 



22. Older than fig. 20, deeper indentations and larger lunule, nat. size. 



23. Posterior lunule and anus of fig. 22. 



24. Encope older than fig. 22, with deeper indentations. 



25. Anus and posterior lunule of fig. 24. 



