PLATE XIV. 



From the Chloritic Marl. 



Fig. 1 a. Pedinopsis Wiestii, Wright, upper surface of the test, natural size. In the 



collection of Mr. Wiest. 



1 b. „ „ under surface, natural size. 



1 c. „ „ lateral view, natural size. 



1 d. Ambulacral area, poriferous zones, and interambulacra, magnified four diameters. 



1 e. Base of an ambulacral area, showing the disposition of the pores, X four times. 

 Fig. 2 a. Fistulous spine of a Diadema from the White Chalk, X six times. British 



Museum. 



2 d. Do. ^ do. do. X six times. 

 2 c. Do. do. do. X six times. 



2 d, e. Do. do. do. X six times. 



From the Lower Greensand. 



Fig. 3 a. PsEunouiADEMA rotulaue, Agassiz, base magnified one half. In the Cabinet 



of Dr. Wright, F.R.S.E. (P. 87.) 



3 b. „ ,, lateral view do. do. 



3 c. „ „ segment of the base, do. four times. 



