PLATE XXXI. 



Abactinal System of 



1. Paiasalenia gratiosa, copied from A. Agassiz. 



2. Temnopleurus Reynaudi, copied from A. Agassiz. 



3. Temnechinus raaculatus, copied from A. Agassiz. 



4. Trigoaocidaris albida, copied from A. Agassiz. 



5. Trigonocidaris monolini, copied from A. Agassiz. 



6. Pleurechinus bothryoides, copied from A. Agassiz. 



7. Strongylocentrotus Drobachieusis (anal plate), copied from A. Agassiz. 

 8-10. Toxopneustes variegatus, copied from A. Agassiz. 



11. Echinus horridus, copied from A. Agassiz. 



