PLATE LXXI. 



Cardiaster pillula, Lamarck. 

 From the Wliite Chalk, 



Fig. 1 a. Upper surface, natural size. Museum, School of Mines. (P. 325.) 



b. Under do. do. 



c. Lateral view, magnified two diameters. 



d. Posterior border and periprocte, natural size. 



e. Anterior do and anteal sulcus. 



/, Part of the cheek with fasciole, magnified. 



g. The elongated apical disc do. 



h. Interambulacral plates, showing surface sculpture, highly magnified. 

 Fig. 2. Fhnt mould showing the poriferous zones. 

 Fig. 3 a. Flint mould of another specimen, showing position of the vent. 



h. Anal plates for closing the periprocte. 



Cardiaster Benstedi, Forbes. 

 From the Lower Greensand. 



Fig. 4 a. Upper surface, natural size. My collection. (P. 293.) 



b. Under do. do. 



c. Lateral view do. 



d. Posterior border and periprocte, natural size. 



e. Anterior do. and anteal sulcus do. 

 Fig. 5. Large specimen showing poriferous zone. 



