PLATE XXIII. 



COLLYRITES FROM THE INFERIOR OoLITE AND CORAL RaG. 



Inferior Oolite Species. 



1 a. CoLLYRiTES ovALis, Leske, p. 314. Upper surface, natural size. 



b. Under surface of the same test. 



c. Lateral view of ditto. 



d. Posterior view of ditto. 



e. Ambulacral areas, poriferous zones, and inter-ambulacral plates, magnified thrice. 

 /. Primary tubercles and miliary granules, highly magnified. 



y. Anterior view of a smaller test. 



Coral Bag Species. 



2 a. CoLLYRiTEs BicoRDATA, Lcskc, p. 319. Upper surface, natural size. 

 h. Under surface of the same test. 



c. Lateral view of ditto. 



d. Posterior view of the same, showing the anal opening. 



e. Ambulacral area, poriferous zones, and inter-ambulacral plates, magnitied thrice. 



/. Anterior pair of ovarial plates, and madreporiform body, with the single, and 



anterior pair of ocular plates, magnified four times. 

 g. Primary tubercles, and miliary granules, of the dorsal plates, highly magnihed. 

 h. Primary tubercle, and hexagonal areolas from the base ; ditto. 



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