PLATE XXIX. 



Clypeus Plotii, Klein. 



From the Inferior Oolite. 



1 a. Clypeus Plotii, Klein, p. 360. Posterior view, showing the anal valley, oblong 

 vent, and postero-lateral ambulacra. 



b. Lateral view of the same test. 



c. Arabulacral area, zones, and inter-ambulacral plates, magnified two-and-a-half times. 



d. Apical disc, magnified two-and-a-half times. 



e. Primary tubercles, and miliary granules, from the upper surface, highly magnified. 

 / Ditto, from the base, ditto ditto. 



y. Ambulacral area, and poriferous zones, at the base ; magnified four times. 

 //. Mouth-opening, peristome, and oral lobes ; magnified two-and-a-half times. 



