PLATE XXXllI 



MICIII<:LINIA CONVEXA irOitBiGXY (Page 432) 



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

 cell to corallum witli nineteen calices. 'I'iie figun; represents parallel 

 horizontal sections through the corallum ; showing the inimbor and form 

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

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

 1, 2, S, 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. 



