PLATE XII. 



CORALS FROM THE GAULT. 

 Fig. 

 2' y Varieties of Trocliocyathm Harveyamis, Ed. and H. (P. 33.) 



3. Magnified view of the ends of the costse of one of the varieties. 



4. A longitudinal section of a variety, slightly magnified. 



5. A variety of Batliycyathm Soiverbyi, Ed. and H. (P. 35.) 



6. Its costae, magnified. 



7. The corallum of Batkycyathus Sowerbyi, Ed. and H. (P. 35.) 



8. A variety of Caryophyllia Boiverbanki, Ed. and H. (P. 32.) 



9. Its costae, magnified. 



10 to 16. Views of Smilotrochus elonyatus, Duncan. (P. 36.) 



12. Costae, magnified. 



14. The calice of a young specimen, magnified. 



16. The costae, magnified. 



17. Cox^\\\xm oi Smilotrochus insiffnis,'D\ync^x\. (P. 37.) 



