PLATE XVI. 



Ijchinolampas depressa. 



1. Young specimen, seen from above, 4.0°"' in diam. 



2. Same, from the actinal side. 



3. Same, seen in profile. 



4. Magnified part of test of same. 



5. Anal plates of same. 



6. Part of ambulacral rosette of specimen measuring 7.9°"°- in diam., showing commencement 



of petaloid ambulacra. 



7. Ambulacral rosette of specimen measuring 12. 7""- in diam., somewhat more petaloid than 



previous figure. 



8. Young specimen, seen from above, measuring 12.7""- in diam. 



9. Same, from actinal side. 



10. Same, seen in profile. 



11. Magnified part of test of same. 



12. Still more magnified part of test of same. 



13. Part of test of same, with spines and suckers fully expanded. 



14. Anal plates of same. 



15. Pedicellaria of same. 



16. Spine of same from the interambulacral area. 



17. Young Echinolampas depressa, nat. size, from above. 



18. Same from actinal side. 



19. Profile of same. 



20. Magnified actinostome, showing first trace of bourrelets. 



21. M;»j;nified part of ambulacral rosette of same. 



22. Magnified part of petaloid portion of poriferous zone. 



