PLATE 59, 
1-3. Plexechinus cinctus A. Ag.; Station 3424, 
1. Actinal system of specimen 20 min. in diameter, the same as Pl. 58, fig. 1. 
2, Anal system with surrounding interambulacral plates and part of fasciole of a specimen 
about 20 mm, in length (fragment). 
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3. Development of the coronal plates of the same as fig. 1, seen from the actinal side. 
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