PLATE XLI. 

 From the Red Chalk. 



Fig. 1 a. Peltastes stellulatus, Agassiz. Test, natural size. Rev. T. Wiltshire, 



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



b- „ „ Upper surface, magnified two diameters. 



c- „ „ Lateral view, do. do. 



d- „ „ Apical disc, do. four times. 



e. „ „ Inter-ambulacra, do. do. 



/. „ „ Ambulacra, do. do. 



ff- „ „ 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. 



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



six times. 



Fig. 3. 



Apical disc, magnified four diameters. The 

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



