﻿PLATE LX. 



ECHINOSPATAGUS MuRCHISONIANUS, Mantell. 



From the Upper Greensand. 



Test, upper surface, natural size. British Museum. 

 Do. under do. do. 

 Do. lateral view do. 

 Do. posterior do. do. 

 Apical disc, magnified. 



Plates with tubercles, the fasciole an artist's mistake. 

 Skeleton structure of the ambulacra and poriferous zones and apical disc. 

 Structure of the anteal ambulacrum. 

 Tubercles, boss, and encircling granules, magnified. 



Hemiaster Bailyi, Forbes. 

 From the Gault. 



Fig. 2. Test, natural size. Royal School of Mines. (P. 264.) 



Hemiaster asterias, Forbes. 

 From the Gault. 

 Fig. 3. Test, natural size. Royal School of Mines. (P. 264.) 



Fig. 1 a. 

 b. 

 c. 

 d. 

 e. 



/ 



9- 

 h. 



