Plate 59. 

 1-3. Plexechinus cinctus A. Ag. ; Station 3424. 



1. Actinal system of specimen 20 mm. in diameter, the same as PL 58, fig. 1. 



2. Anal system with surrounding interambulacral plates and part of fasciole of a speci: 



about 20 mm. in length (fragment). 



3. Development of the coronal plates of the same as tig. 1, seen from the actinal side. 



