PLATE Vl. 



Fig. 

 1. Thecosmilia gregana,Vi'QjQ)\ Variety. (Page IS.) 



2. -^ 



I Parts of corallmu, magnified slightly. 



3. 



4. Costse and exotheca, magnified. 



5. The corallum Q>i Symjjliyllia Etheridgei, Duncan. (Page 19.) 

 fi. 

 7. 

 S. CostiB, magnified. 



\ Calices, magnified. 



