PLATE XXXII 

 MICHEL1NIA CONVEXA D'ORBIGNY (PAGES 431, 432) 



FIGURE 1. Diagrammatic representation of upper surface of coral- 

 lum; consisting of parent cell (A) and six peripheral corallites (Jf, #, 

 3, etc.). 



FIGURE 2. The same; showing the introduction of three triangular 

 intermural buds (./', 2', 3', etc.). 



FIGURE 3. Third condition ; with six triangular buds about the 

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



FIGURE 4. Top of corallum ; showing further growth of preceding 

 corallites, with the addition of three peripheral calices ( 4", 5", 6"). 



FIGURE 5. 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, 2, 3, etc.), 

 and representing condition preparatory for new series of interstitial 

 corallites. 



All the figures are natural size. 



