Plate 21a. 



1-3. Fodophora atrata Agass. 



1. Specimen with club-shaped primary radioles, seen from the actinal side. 



2. The same as fig. 1, seen from the abactiual side. 



3. The same seen in profile facing the odd posterior interambulacrura. 

 The odd anterior ambulacrum is at the top of figures 1 and 2. 



This specimen measures 92 mm., and was collected at Mauritius. 



