1 



PLATE LX. 



EcHiNOSPATAGUs MuRCHisoNiANUs, Mantell. 

 From the Upper Greensand. 



Fig. 1 a. Test, upper surface, natural size. British Museum. 



b. Do. under do. do. 



c. Do. lateral view do. 



d. Do. posterior do. do. 



e. Apical disc, magnified. 



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



ff. Skeleton structm'e of the ambulacra and poriferous zones and apical disc. 



h. Structui'e of the anteal ambulacrum. 



i. Tubercles, boss, and encircling granules, magnified. 



Hemiaster Bailti, Forbes. 

 From the Gault. 

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



Hemiaster asterias, Forbes. 

 From the Gault. 

 Fig. 3. Test, natm-al size. Royal School of Mines. (P. 264.) 



