PLATE XI. 



Figs. 1-7. Mycedium fragile Dana, young specimens still simple. 



Fi". 8. Mycedium fragile Dana, young specimens with first circle of buds surrounding the central 



calicle. 

 Figs. 9, 10. Mycedium fragile Dana, young specimens in profile, figured from above in 3 and 7. 

 Figs. 11, 12, 13. Agaricia agaricites Milne-Edw. and Haime, young specimens. 

 Figs. 14 - 19. Siderastrsea galaxea Milne-Edw. and Haime, young specimens still in the simple state. 

 Figs. 20, 21. Siderastraea galaxea Milne-Edw. and Haime, young specimens multiplying by gemmation. 



All the figures are magnified, the natural size being indicated by the small figures. 



