Explanation of Plate VI. 



Fig. 1. Ophiocamax austcra Ver. Ventral view of a part of the 

 disk and base of an arm; m. madreporic plate. ■ X 8. 



Fig. la. The same specimen. Dorsal view of a small part of the 

 disk, including two radial shields, and the basal part of an 

 arm. X 6. 



