PLATE XXXI. 



From the Neocomian or Loicer Greensand. 



Y\g. 1 a. Pkltastes steli.ulatus, Agassiz. Test, natural size. British Museum. 



(P. 152.) 

 1 h. „ „ Lateral view of do., magnified two dia- 



meters. 



Fig. 2. „ „ Under surface, showing mouth opening 



andperistome, magnified two diameters. 



Pig. 3 a. „ „ Upper surface, showing apical disc, mag- 



nified two diameters. 



3 b. „ „ Upper portion of ambulacra and inter- 



ambulacra, magnified six diameters. 



Fig. 4 a. Peltastes Lardy i, Desor. Test, natural size. British Museum. (P. 154.) 



4 b. „ „ Upper surface, showing apical disc magnified two 



diameters. 



4 c. ,, ,, Lateral view of apical disc, magnified two dia- 



meters. 



4 d. „ „ Upper portion of ambulacra, and inter-ambulacra, 



magnified four times. 



