Index of Genera. 



Xlll 



Phyllophorus 



Planktothuria 



Planorbis . 



Platyglossus 



Plutonaster 



Polita 



Poraniopsis 



Porcellanaster 



Pourtalesia 



Prionocidaris 



Pseudarchaster 



Pseudocucumis 



Psilaster . 



Psolus 



Pteraster . 



Pupisoma 



Raia 



Regadrella 

 Retaster . 

 Rumina 



Salenia 



Salmacis . 



Schizaster . 



Selachophidium . 



Spatagobrissus . 



Spatangus 



Sph age branchus 



Stereocidaris 



Stichaster 



Stichopus 



R 



S 



u 



V 



PAGE 



378 



189 



90 



438 



382 

 182 



93 

 415 



99 

 266 

 386 



76 

 140 

 387 

 395 

 233 



82 

 173 



398 



186 

 182 



183 



