PLATE XXIII. 



Moira atropos. 



1. Horizontal section, showing arrangement of plates round actinostome. 



2. Longitudinal section. 



3. Horizontal section, showing the petaloid ambulacra as seen from the interior of test. 



4. Seen from actinal pole. 



5. Seen from abactinal pole. 

 G. Profile. 



CAU Jtffn. nat. size.) 



