FOSSIL SPOA T GES. ETC. 



33 



they do not ; as if, in the former case, their silicated 

 shells had been dissolved, and the silica drained off to 



Fig. 25. Transverse sections of Foraminifera ir 

 limestone (magnified). 



Fig. 24. Appearance of 



fossil Foraminifer in 



Carboniferous limestones 



(magnified). 



Fig. 26. Fragment of fossil Foraminifer (magnified). 



Fig. 27. -Radiolarian (recent). 



