Pl^TE 96, 



1-3. Lytechinus dyscritus, sp. nov. 



1. Side view. X 5. 



2. Aetinostome and base of corona. X 8. 



3. Abactinal system. X 8. 



4-6. Lytechinus callipeplus, sp. nov. 



4. Side view. X 5. 



5. Aetinostome and base of corona. X 7. 

 C. Abactinal system. X 8. 



