PLATE XXX Yin, 



1. 



2. 



2a -c. 



3. 



4, 5, 6. 



7, 8, 9. 



10. 



10" -r. 



11. 



12. 



12"-''. 



12'-'". 



13. 



14, 14^-''. 



14a -4. 



15. 

 16, 17. 



18. 



19. 



20. 



21. 



22. 



22^ 



22" - '>. 



23. 

 24, 25. 



26. 



27. 



28. 



28'. 



29. 



30, 30«, 31. 



32, .33. 



34, 35. 



36 -3S. 



Cidaris Thouarsii. A plate of disk froiu aiiilmlacral tube. 



Cidaris Thouarsii. Siiicule, I'roni amliulacral tul)f. 



Cidaris tribuloides. Siiicules from mesentery of intestine. (Stewart.) 



Diadema mexicanum. Plate from ambulacral tubes. 



Diadema mexicanum. Spicules from ambulacra! tube. 



Astlienosoma hystrix. Spicules from ambulacral tubes. 



Arbacia punctulata. Plate from amljulacral tube. 



Arbacia pustulosa. Spicules from ambulacral tube. (Perrier.) 



Colobocentrotus atratus. Plate from ambulacral tube. 



Coloboceutrotus atratus. Spicule from ambulacral tube. 



Echinometra. Spicules from ovaries. (Stewart.) 



Echinometra. Spicules from ambulacral tubes. (Stewart.) 



Strongylocentrotus Drobachiensis. Plate from amliulacral tube. 



Strongylocentrotus Drobachiensis. Spicules from ambulacral tubes. 



Strongylocentrotus Drobachiensis. Spicules from ovaries. 



Toxopneustes pileolus. Plate from ambulacral tube. 



Spicules from ambulacral tubes. 

 Plate from ambulacral tube. 

 Spicule from amljulacral tube. 

 Plate from ambulacral tube. 

 Interambulacral abactinal perlicellaria. 

 Interambulacral abactinal peilicellaria. 

 Plate from ambulacral tube. 

 Spicules from ovaries. (Stewart.) 

 Plate from amliulacral tube. 



Sjiicules from actinal ambulacral tubes of phyllodes. 

 Echinoneus semilunaris. Spicule from ambulacral tube. 

 Lovenia elongata. Spicule from actinal ambulacral tube of phyllodes. 

 Lovenia elongata. Interior view of part of actinal floor. 

 Lovenia elongata. Interior view of lateral interambulacral space. 

 Metalia maculosa. Spicules from actinal amlmlacral tubes of phyllodes. 

 Echinobrissus recens. Spicules from ambulacral tubes. (Perrier.) 

 Echinocardium flavescens. Spicules from amljulacral tubes. (Perrier.) 

 Spatangus purpureus. Spicules from ambulacral tubes. (Perrier.) 

 Brissopsis lyrifera. Spicules from ambulacral tubes. (Perrier.) 



Toxopneustes pileolus. 

 Phymosoma crenulare. 

 Phvmosoma crenulare. 

 Amblypneustes griseus. 

 Amblypneustes griseus. 

 Mespilia globulus. 

 Mespilia globulus. 

 Mespilia globulus. 

 Salmacis globator. 

 Meoma ventricosa. 



