PLATE LXVIII. 

 Cardiaster fossarius, Benett. 

 From the Upper Greensand. 



Fig. 1 a. Upper surface, natural size. Cunnington collection. British Museum. (P. 297.) 



b. Under surface do. 



c. Lateral view do. 



d. Posterior do. do. 



e. Anterior border, do. 



Cardiaster Perezii, Sismonda. 

 From the Upper Greensand. 



Fig. 2 a. Upper surface, natural size. Jermyn Street Museum. (P. 299.) 



b. Lateral view do. 



c. Anterior border do. with anteal sulcus. 



