PLATE XIV°. 



Spatangus purpureus, /. 1. 



1. Abactinal system, and part of ambulacral system, from interior of test, magnified l^'i. 



Echinobrissus recens, /2-4. 



2. Seen from abactinal pole, denuded, magnified |. 



3. Same, from interior of test. 



4. Actinal part of test, seen from interior. 



Echinoneus cyclostomus, /. 5-iO. 



5. Seen from abactinal pole, magnified s^'i. 



6. Same seen from actinal side. 



7. Same, abactinal part of test, seen from interior. 



8. Same, actinal part of test, seen from interior. 



9. Magnified cluster of tubercles of abactinal part of test. 

 10. Magnified cluster of tubercles of actinal part of test. 



