PLATE I. 

 Dorocidaris papillata. 



1. Seen from abactinal side, with smootli spines. 



2. Somewhat larger s]iecinien, denuded to show abactinal system. 



3. Same from the actinal side. 



4. Same in profile. 



5. Profile of specimen with serrated spines. 



(All Jigs, natural size.) 



