﻿PLATE IV. 



Pentagonaster lunatus, Woodward, sp. (P. 25.) 



From the Upper Chalk. 

 Fig. 



1 a. Actinal aspect of the type specimen ; natural size. (Coll. Norfolk and 



Norwich Mus.) 



b. An actinal intermediate plate ; magnified. 



c. An infero-marginal plate ; magnified. 



Pentagonastee megaloplax, Bladen. (P. 27.) 

 From the Lower Chalk. 



2 a. Actinal aspect of the example figured by Forbes, under the name of Ooniaster 



(Astrogonium) lunatus ; natural size. (Coll. Brit. Mus.) 



b. An infero-marginal plate ; magnified 3 diameters. 



c. Lateral view of the margin ; natural size. 



3 a. Actinal aspect of another example ; natural size. (Coll. Brit. Mus.) 



b. An actinal intermediate plate; magnified 6 diameters. 



c. Adambulacral plates ; magnified 6 diameters. 



4 a. Actinal aspect of an example from the Upper Chalk of Bromley ; natural 



size. (Coll. Brit. Mus.) 



b. Lateral view of the margin ; natural size. 



c. Lateral surface of an infero-marginal plate; magnified. 



d. An infero-marginal plate ; magnified. 



e. An actinal intermediate plate ; magnified 6 diameters. 



