PLATE VI. 



Fig. 



1. Thecosmilia gregaria, M'Coy. Variety. (Page 18.) 



2.-) 



1 Parts of corallum, magnified slightly. 



4. Costae and exotheca, magnified. 



5. The corallum of Symphyllia Etheridgei, Duncan. (Page 19.) 



i Calices, magnified. 

 8. Costse, magnified. 



