TLATE XVIII. 



Faleopneustes hystris A. Ag. 



Fi''. 1. Left half of 1 with spines, seen from above, natural size. 



Fi". 2. Bight half of test from above, denuded. 



Fig. 3. Abaetinal system (*). 



1 . L, seen from actinal side, covered with spines. 



H_. ;,. Same as Fig. -, seen from actinal side, denuded. 



Fi». 6. Actinostome (j), seen from actinal side. 



| , ;. Same a Fig. 6, seen from the interior. 



Fig. 8. Anal system (f). 



