PLATE XXIX B. 



Fig. 1 a. 



3 6. 

 Fig. 4 a. 



4 6. 



4 c. 

 4d. 



5 «. 

 5 6 



From the Upper and Lower Chalk. 



Gltphocyphus radiatus, HiBninghaus, sp. Test, upper surface, magnified 



twice. (P. 121.) 



,, „ Lateral view, magnified twice. 



,, „ Areal plates and zones, do. ten times. 



,, „ Under sui't'ace, do. twice. 



„ „ Apical disc (from M. Cotteau's figure), magnified. 



,, „ Areal plates and zones (do. do.) do. 



„ „ Inter-ambulacrum (do. do.) do. 



„ „ Ambulacrum (do. do.) do. 



EcHiNOTHURiA FLORis, /Fbofi?zi;a?-(/. Portion of test, natural size, in the British 



Museum. (P. 125). 



Poriferous zones, magnified four times, do. 



Do. do., do. do. 



Portion of spine, do. six times. 



Do. do., do. do. 



Areal plates, do. four times. 



Ovarial plates, natural size. 



Jaws, forming " the Lantern of Aristotle," 



natural size. 



