PLATE II*. 



Dorocidaris papillata, /! i - 5. 



1. Abactinal system, magnified '-^^. 



2. Actinal membrane and part of adjoining test showing continuation of the ambulacral 



system along the imbricated membrane, magnified IJi.. 



3. Same as fig. 2, seen from the interior of test 



4. Interior view of abactinal system of fig. 1. 



5. Interior profile view of part of test, to show auricles, magnified l^. 



Diadema setosum, / G-10. 



C. Abactinal part of test, showing abactinal system, magnified \Ji. 



7. Same seen from interior of test 



8. Actinal part of test adjoining the actinostome. 



9. Same as fig. 8, seen from interior of test. 

 10. Same seen in profile, to show auricles. 



