﻿PLATE V. 



Tomidaster suLCATus, Sladen. 



From the Grey Chalk. 

 Fig. 

 1 a. Actinal aspect ; natural size. (Coll. Brit. Mus.) 



b. Actinal intermediate plates ; magnified. 



c. Adambulacral plates ; magnified 3 diameters. 



Calliderma mosaicum, Forbes, sp. (P. 9.) 

 From the Lower Chalk. 



2 a. Abactinal aspect ; natural size. (Coll. Brit. Mus.) 



b. Lateral view of the margin ; natural size. 



c. Abactinal plates ; magnified. 



d. Supero-marginal plates ; magnified. 



e. Madreporiform body and surrounding plates ; magnified. 



