fe 
PLATE 80, 
1-7. Cystechinus Wyvillii A. Ag. 
Specimen 18 mm. in length, seen from the actinal side; “Challenger ” Station 146. 
Actinal system and surrounding plates of specimen 56 mm, in diameter; “ Challenger He 
Station 147. 
Abactinal system and adjoining plates of same specimen as fig. 1. 
. Interior view of same as fig. 3. 
. Abactinal system and adjoining plates of same specimen as fig. 2. 
Interior view of fig. 5. 
Anal system of same specimen as fig. 2. 
‘ 
4 
4 
/ 
pe oS oS 
