PLATE LVI. 



Clypeop'xgus Fittoni, Wriglit, nov. sp. 



From the Lower Greensand. 



Fig. 1 a. Length of the test, natural size. Rev. T. Wiltshire, and my collection. 

 (P. 247.) 

 I. Upper surface, magnified two diameters. 



c. Under do. do. do. 



d. Lateral view do. do. 



e. Posterior do. do. do. 



/. Ambulacral plates and poriferous zones, magnified six times. 



2 a. Test of another specimen, natural size. 



3 a. Length of do. do. 



b. Upper surface, magnified two diameters. 



c. Under do. do. do. 



d. Posterior do. do. do. 



e. Lateral do. do. do. 



/. Ambulacral plates and zones, magnified. 

 ff. Basal tubercles of this form are found near the peristome. 

 Fig. 4. Another test, natural size. 



