PLATE III\ 



Centrostephauus Rodgersii, /. 1-S. 



1. Seen from the abactinal pole, j nat, size. 



2. Profile of same, f nat, size. 



'■i. Same from the actinal side, f nat. size. 



Astropyga pulvinata, /. ^, 5. 



4. Young seen in profile, nat. size. 



5. Same seen from the abactinal pole. 



