PLATE 101. 

 1-3. Prionechinus depressus A. Ag. and Cl. 



1. Side view of denuded test. X 5. 



2. Part of actinostome and base of corona. X 10. 



3. Abactinal system. X 7. 



4-6. Prionechinus sculptus A. Ag. and Cl. 



4. Side view of denuded test. X 5. 



5. Part of actinostome and base of corona. X 10. 



6. Abactinal system. X 10. 



