PLATE XIII. 



CORALS FROM THE GAULT. 



Fig. 



1. A variety of Trochocyathm Harveyanus, Ed. and H. The base. (P. 32 and 33.) 



2. Costaj and septa, magnified. 



3. A variety of the same species. 



4. Costae and septa, magnified. 

 13. A transverse section, magnified. 



5. Leptocyathus gracilis, Duncan. Under surface. (P. 34.) 



6. The under surface or base, magnified. 



7. A transverse section, magnified. 



8. A side view, magnified. 



9. Smilotrochus insignis, Duncan. (P. 37.) 



lO.. 



11. \Young of Smilotrochus elongatus, Duncan. (P. 36.) 



12.J 



