APOROSA. 



193 



forms more or less closely related to the living Astrcea, such 

 as Prionastrcea, Isastrcea (fig. 80), Sepfastrcea, Convexastrcea, 

 Tkamnastrcea, Heliastrcea, &c. Lastly, not to mention others, 



Fig. 79. Thecosmilia annularis. Coral -rag, England. 



we have a group of forms very similar to the preceding, but 

 having the calices of the separate corallites more or less com- 

 pletely confluent with one another. As examples of this 



V\. 80. Inunlrffia ullunya; portion of u small polished slab, of the natural size, and a few 

 calices enlarged. Jurassic (Portland Oolite). 



group, we may take Meandrina (the " Brain-corals "), Lati- 

 meandra, and Diploria. 



5. Fungidce. In this group, the corallum is simple or 

 compound, usually discoidal or laminar, the calices shallow 



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