Plate 5. 



1-4. Centrocidaris Doederleini A. Ag. ; all figures from a specimen 26 mm. in diameter; 



Station 3369. 



1. Actinal system. 



2. Al)aotinrJ system. 



3. Coronal plates seen facing the odd anterior ambulacrum, with 7 primary coronal plates. 



4. Seen facing the left ambulacrum. 



