Exi'I.ANATIONH OK PlATES 301 



Calatuosi'ongia TiFFANYi, sp. nov. 



Page 168. 



Figures 5, 6. Views of a somewhat compressed specimen showing the rate 

 of expansion of the sponge and its obscurely prismatic surface. 

 Waverly group. Ohio {precise locality not hnowri). 



