Plate 82. 

 1-4. Arseosoma Owstoni Mortens., juv. 



1. Actinostome and base of corona of young individual shown in figures 5 and 6, 



Plate 81. X 5. 



2. Abactinal system of same. X 5. 



3. Actinal ambulacral and interarabulacral plates, just below ambitus, x 5. 



4. Abactinal ambulacral and interambulacral plates, just above ambitus, x 5. 



6-8. Araeosoma gracile A. Ag. and CI., ■? juv. 



5. Actinostome and base of corona of individual shown in figures 3 and 4, Plate 81. X 4. 



6. Abactinal system of same. X 5. 



7. Actinal ambulacral and interambulacral plates, just below ambitus, x 4. 



8. Abactinal ambulacral and interambulacral plates, just above ambitus, x 5. 



