﻿PLATE LTII. 



ECHINOCONUS ABBREVIATUS, DeSOr. 



From the Tipper Chalk. 

 Fig. 1. Large test, lateral view, natural size. My collection. (P. 226.) 



Echinoconus subrotundus, Mantell. 

 From the Lower Chalk. 



Fig. 2 a. Upper surface, natural size. My collection. (P. 219.) 



b. Under do. do. 



c. Lateral view do. 



d. Posterior do. do. 



e. Ambulacra! and inter-ambulacral plates and poriferous zones, magnified four 



diameters. 

 /. Apical disc, highly magnified. 

 3. Inter-ambulacral basal plates, magnified six diameters. 



