PLATE XXXII 

 MICHELINIA CONVEXA D'Orbigny (Pages 431, 432) 



FiGURK 1. — Diagrammatic representation of upper surface of coral- 

 lum; consisting of parent cell (A) and six peripheral corallites (i, 2, 

 3, etc.). 



Figure 2. — The same; showing the introduction of three triangular 

 intermural buds (r, 2', 3\ etc.). 



Figure 3. — Third condition; with six triangular buds about the 

 parent corallite, and three on the periphery of the coralluni. 



Figure 4. — Top of corallum ; showing furtlier growth of preceding 

 corallites, with the addition of three peripheral calices ( 4", 5", G"). 



Figures. — The same during a succeeding stage; showing increase 

 in size of corallites, and modifications produced. 



Figure 6. — Completed growth of first system of intermural gemma- 

 tion ; showing dissociation of original series of corallites (A, 1, S, 3, etc.), 

 and representing condition preparatory for new series of interstitial 

 corallites. 



All the figures are natural size. 



