Plate 77. 

 Araeosoma leptaleum A. Ag. and CI. 



1. Actinostome and base of corona. X 1.8. 



2. Abactinal system, x 2. 



3. Actinal ambulacral and interambulacral plates twelve millimeters from ambitus. X 1.6- 



4. Abactinal ambulacral and interambulacral plates eight millimeters from ambitus. X 2. 



