PLATE XXIV. 



ECHINOBRISSI FROM THE INFERIOR OoLITE, GrEA'I' OoLITE, AND CORNBRASH. 



Inferior Oolite and Cornbrash Species. 



1 a. EcHiNOBRissus CLUNicuLARis, Lllbwyd, p. 332. Upper surface, natural size. 

 h. Under surface of the same test, natural size. 



c. Lateral view of ditto ditto. 



d. Posterior view, showing the anal valley, and inter-ambulacrum. 



e. Ambulacral area, poriferous zones^, and inter-am bulacral plates ; magnified thrice. 

 /". Ambulacral area, and petaloid portion of the poriferous zones ; highly magnified. 

 g. Apical disc, and madreporiform body ; magnified four times. 



h. Primary tubercles, and miliary granules, highly magnified. 

 i. Diagram of the upper surface, showing the relative anatomy of the shell. 

 h. The largest test of this species yet found ; from the Rev. A. W. Griesbach's cabinet 

 natural size. 



Great Oolite Species. 



2 a. EcHiNOBRissus WooDWARDi, Wrif/U, p. 337. Upper surface, natural size. 



b. Under surface of the same test, natural size. 



c. Lateral view of ditto, showing its tumid sides ; natural size. 



d. Ambulacral area, poriferous zones, and inter-ambulacral plates ; magnified four times. 



e. Upper surface of a large test. 



