CERAMOPORA. 



(Page 563.) 



Ceramopora confluens, Hall. 



Fig. 14. A zoarium entirely incrusting a specimen of Platyostoma 



niagarense, natural size. 

 Fig. 16. An enlargement, showing the character of the cells and the 

 monticules. x6. 

 Niagara group. Waldron, Indiana. 



BOTRYLLOPORA. 



(Page 592.) 



BoTRYLLOPORA SOCIALIS, NicholsOU. 



Fig. 16. An enlargement of a portion of a colony of this species. x6. 

 Fig. 17. An enlargement of a thin section showing the cell tubes and 

 the intercellular vesicle. x6. 

 Hamilton group. JVew York. 



659 



