PLATE LXX. 



Infulaster excentricus, Rose. 

 From the Wldte Chalk of Norfolk. 



Fig. 1 a. Upper surface, natural size. My collection. (P. 305.) 



b. Under do. do. do. 



c. Lateral view do. 



d. Posterior border and periprocte. 



e. Anterior do. and anteal sulcus. 



/. Surface sculpture of interanibulacral plates, magnified three times. 



g. Primary tubercles and encircling granules, highly magnified. 



h. Part of the cheek, with a portion of the fasciole do. 



i. Details of test and apical disc as shown in a flint mould, natural size. 



k. The apical disc, highly magnified. 



Infulaster rostratus, Forbes. 

 From the White Chalk near Plumstead. 



Fig. 2 a. Lateral view, natural size. Museum, School of Mines. (P. 307.) 

 b., c, d., e. Different views of a specimen from Chalk near Plumstead. 

 /. Part of the cheek and fasciole. Museum, School of Mines. 



Figs. 3 a. Outline, partly restored, of a large specimen from Norfolk Chalk, in 

 the late Mr. Rose's Collection. 



