WHAT IS EOZOON f 



73 



tendency to form a supplemental or intermediate skele- 

 ton with canals,, though the canals themselves in their 

 arrangement more nearly resemble Calcarina, which 



FIG. 19. Section of a Nummulite,from Eocene Limestone of Syna. 



Showing chambers, tubuli, and canals. Compare this and fig. 20 with figs. 10 



and 11. 



FIG. 20. Portion of shell of Calcarina. 



Magnified, after Carpenter, fa.) Cells, (ft.) Original cell-wall with tubuli. (c.) 

 Supplementary skeleton with canals. 



is represented in fig. 20. In its superposition of many 

 layers, and in its tendency to a heaped up or acervuline 

 irregular growth it resembles Polytrema and Tinoporus, 



