P LAT E X X XV. 



Upper tier, three specimens on left side, Cyathopiiyllum Hai.lii. Hamilton 

 group, Widder. 

 Upper specimen in centre, same species, from Thunder Bay. 

 Three specimens on the right with more delicate structure, Cyathophyl- 

 LUM JUVENIS. Hamilton group, Widder. 

 Lower tier, two left-hand specimens, CyathophyllUiM zyphus. Hamilton group, 

 Long Lake. 

 Group on the right side, Cyathophyllum cornicula. Corniferous lime- 

 stone. 



