PLATE XXXII. 



From fhe Upper Greensand. 



Fig. 1 a. Peltastes CLATHRATus, ^y(7ss?0. Test, natural size. British Museum. (P. 150.) 



,, Upper surface, showing the disc in sitn, 



magnified two diameters. 



„ „ Under surface, showing mouth opening and 



peristome, magnified two diameters. 



„ ,, Ambulacra and inter-ambulacra, with pori- 



ferous zones, magnified six diameters. 



„ „ Single plate and portion of ambulacra with po- 



riferous zones, magnified eight diameters. 



„ ,, Mouth opening, magnified four diameters. 



„ ,, Apical disc detached, magnified four dia- 



meters. 



„ ,, Lateral view of another test, magnified two 



diameters. 



„ „ Apical disc detached, magnified two dia- 



meters. 



