Plate 98. 

 1, 2. Strongylocentrotus pulchellus A. Ag. and CI. 



1. Part of actinostome and base of corona. X 8. 



2. Abactinal system. X 8. 



3, 4. Lytechinus euerces, sp. nov. 



3. Part of actinostome and base of corona. X 5. 



4. Abactinal system. X 5. 



5-8. Pachycentrotus australiae, comb. nov. 



5. Part of actinostome and base of corona. X o. 

 G. Abactinal system. X 5. 



7. Two ambulacral plates from mid-zone, showing o elements in one. X 5. 



8. The same seen from within the test. X 5. 



