The following report on the Madreporaria Aporosa and the Madrepor- 

 aria Rugosa forms a second part to the previously published report on 

 the Madreporaria Perforata and the Alcyonaria, the two forming parts 

 I and II of the fourth volume of "Contributions to Canadian Palaeon- 

 tology. " Thirteen plates illustrating the text accompany the present 

 publication. 



GEORGE M. DAWSON. 



Geological Survey Department, 

 Ottawa, December, 1900. 



