PLATE XXXIV. 



From the Upper Greensand. 



Fig. 1 a. Pe1;Tastes umbrella, Agassiz. Test, magnified two diameters. British Museum. 



(P. 158.) 



Lateral view of the same, magnified two dia- 

 meters. 



Inter-ambulacra, ambulacra, and poriferous zones, 

 magnified six diameters. 



Apical disc detached, magnified four diameters. 



Under surface of another test, magnified two 

 diameters. Mr. Cunnington, F.G.S. 



Apical disc of another test, magnified four dia- 

 meters. 



Test magnified, two diameters. British Museum. 



Under surface of do., do., do. 



Lateral view of do., do., do. 



Apical disc detached, four diameters, do. 



Ambulacra, inter-ambulacra, and poriferous 

 zones, magnified six diameters. 





1 b. 





?» 5J 





1 c. 





J) ?? 





1 d. 





;3 ?? 



Fig. 









■>'. )) 



Fig. 



;i 





? ' 3 J 



Fig. 



4 a. 

 4 h. 



S 



ALENIA GIRBA, AgaSHlZ 





4 c. 





?J J> 





4^. 





M ;> 





4 e. 





* 



