PLATE XLL 



From the lied Chalk, 



Fig. 1 a. Peltastes stellulatus, Agassiz. 



b. 

 c. 

 d. 

 e. 



/ 



9- 



Test, natural size. Rev. T. Wiltshire, 

 F.G.S. (P. 153.) 



Upper surface, magnified two diameters. 



Lateral view, do. do. 



Apical disc, do. four times. 



Inter-ambulacra, do. do. 



Ambulacra, do. do. 



Single plate and portion of ambulacra, 

 magnified six times. 



From the Lower White Chalk. 



Fig. 2 a. Salenia granulosa, Forbes. Upper surface, magnified two diameters. The 



British Museum. (P. 179.) 



b. „ ,, Under surface, magnified two diameters. 



c. „ „ Lateral view, do. do. 



d. „ „ Inter-ambulacral area, magnified four times. 



e. ,, „ Ambulacral do. do. do. 



f. ,, „ Single plate and portion of ambulacra, magnified 



six times. 



Fig. 3. 



Apical disc, magnified four diameters. The 

 Rev. T. Wiltshire, F.G.S. 



