Plate 6. 

 1-4. Porocidaris Milleri A. Ag.; all figures natural size ; Station 3381. 



1. Seen from the actinal side. 



2. Seen from the abactinal side. 



3. Denuded test, showing the abactinal system of a female. 



4. Denuded test, showing the abactinal system of a male. 



