Plate 80. 

 ArzeoBoma pyrochloa A. Ag. and CI. 



1. Actinostome and base of corona, x 1.3. 



2. Abactinal system, x 2. 



3. Actinal ambulacral and interambulacral plates, nine millimeters from ambitus. 



Slightly reduced. 



4. Abactinal ambulacral and interambulacral plates, nine millimeters from ambitus. 



Natural size. 



