﻿PLATE I. 



Calliderma Smithing, Forbes, sp. (P. 6.) 



From the Lower Chalk. 

 Fig. 

 la. Actinal aspect ; natural size. (Coll. Brit. Mus.) 



b. Lateral view of the margin ; natural size. 



c. Infero-marginal plates; magnified 2 diameters. 



d. Lateral view of the marginal plates ; magnified. 



e. Adambulacral plates ; magnified. 



/. Actinal intermediate plates ; magnified 3 diameters. 



