FOSSIL CORALS. 



group these objects, along with others similarly star- 

 rayed in their shapes, into the sub-kingdom Radiata^ 

 now no longer accepted by naturalists. In this 

 radiated structure, therefore, the rugose corals re- 



Fig. 42. Horizontal section across block containing 

 Lithostrotion junceum (Carboniferous limestone). 



Fig. 43. Vertical section of Lithostrotion 

 junceum. 



Fig. 44. Amplexus coralloides 

 (Carboniferous limestone). 



semble the aporose corals. But whereas the tabulate 

 and rugose corals (with few exceptions) are limited 

 to Palseozoic rocks, the aporose corals are peculiar to 



