PLATE LXV. 



Enallaster Fittoni, Forbes. 



From the Lower Greensand. 



Fig. 1 a. Upper surface, natural size. Royal School of Mines. (P. 288.) 



b. Under do. do. 



c. Lateral do. do. 

 e. Anterior do. do. 



/. Portion of dorsal plates and tubercles, magnified three times. 



Fig. 2 a. Upper surface of test, natural size. My collection. 



b. Apical disc and single ambulacrum, magnified. 



c. Anterior petaloid ambulacrum, showing poriferous zones. 



Holectypus bistriatus, Wright. 

 From Chloritic Marl of Chard. 



Fig. 3 a. Test, upper surface, natural size. My collection. (P. 233.) 



b. Lateral view, do. 



c. Structure of an ambulacrum, showing the bistriated marginal arrangement. 



