EXPLANATION OF PLATE 1 



Figs. 1-3 Longitudinal sections of distal portions of corallites. 



4, 5 Longitudinal sections showing types of tabulae. 



6-20 Transverse sections showing types of septa. 



21-26 Longitudinal sections of left half of corallites showing types of septj 



27-31 Transverse sections showing types of dissepiments. 



[22] 



