PLATE XXXIII 



MICHELINIA CON VEX A D'Okbigny (Page 432) 



Figure 1. — Development of a group of corallites from initial conical 

 cell to corallum with nineteen calioes. The figure represents parallel 

 horizontal sections through the corallum ; showing the number and form 

 of the calioes, their order of development, and the modifications taking 

 place during growth. The parent cell is marked A ; first series of calices, 

 1, 2, 3, etc. ; first series of intermural buds, 1\ 2', 3', etc. ; peripheral 

 series, 1", 2", 3", etc. Notation corresponds with that of preceding plate. 

 Natural size. 



