PLATE XXXIII. 

 From the Upper Greensand. 



Pig. 1 a. Salenia petalifera, Desmarest. Test, natural size. British Museum. 



1 fj. „ „ Upper surface, showing disc in situ, magni- 



fied two diameters. 



\ c. „ ,, Lateral view of the same test, magnified two 



diameters. 



1 d. „ „ Ambulacra, inter-ambulacra, and poriferous 



zones, magnified four diameters. 



1 e. „ „ Apical disc detached, magnified four dia- 



meters. 



1 /. ,, „ Single primary tubercle profile, magnified 



four diameters. 



Fig. 2 a. ,, „ Under surface, showing mouth opening and 



peristome, magnified two diameters. 



2 b. ,, „ Ambulacra and poriferous zones, magnified 



six diameters. 



Fig. 3. „ ,, Inferior portion of inter-ambulacra, mag- 



nified six diameters. 



Fig. 4 a. „ ,, Upper surface of another fine test, Mr. 



Cunnington, F.G.S. 

 4 b. „ „ Under surface, do., do. 



