TAB. XXIII. 



CORALS FROM THE GREAT OOLITE. 



Stylina Ploti (p. 106). 



Fig. 1. A specimen, the surface of which is much worn ; natural size. 



ISASTREA LIMITATA (p. 114). 



Fig. 2. A specimen, showing the cahcular surface ; natural size. 



2 a. Calices, magnified. 



Thamnastrea mammosa (p. 119). 



Fig. 3. A gibbose specimen ; natural size. 



3 a. Calices, magnified. 



Thamnastrea scita (p. 119). 



Fig. 4. A fragment, showing the calicular surface and the superposed layers that 

 compose the mass of the corallum. 



4 a. Calices, magnified. 



Convexastrea Waltoni (p. 109). 



Fig. 5. A specimen of a massive form ; natural size. 



5 a. Calices, magnified. 



6. A dendroid variety of the same specimen ; natural size. 



