﻿PLATE LVII. 



Trematopygus Faringdonensis, Wright. 

 From the Lower Greensand. 



Fig. 1 a. Test, upper surface, natural size. My collection. (P. 253.) 



b. Do. do. magnified one and a half times. 



c. Do. do. do. do. 



d. Do. lateral view do. one half. 



e. Do. posterior do. do. do. 

 /. Apical disc, magnified. 



(/. Ambulacral and inter-ambulacral plates and poriferous zones, magnified six 

 times. 



h. Basal tubercles, showing structural details. 



Caratomus rostratus, Agassiz. 

 From the Ujjjjer Greensand. 



Pig. 2 a. Vertical line, showing natural size. (P. 255.) 



b. Upper surface, magnified six diameters. 



c. Under do. do. do. 



d. Posterior do. do. do. 



e. Lateral view do. do. 



