The title of the present volume having been found to be too restricted 

 in its scope, it has been decided to change it from " Contributions to 

 the Micro-Palaeontology of the Cambro-Silurian Rocks of Canada," to 

 '' Contributions to Canadian Micro-Palaeontology." 



Part III., now presented, which has been kindly prepared by Prof. 

 T. Rupert Jones, F.R.S , consists of an illustrated Report on Ostracoda 

 from the Cambro-Silurian, Silurian and Devonian rocks at various 

 localities in the Dominion, with a critical note on the species de- 

 scribed by him in 1858, and figured in Decade 3 of *' Canadian 

 Organic Remains." 



It contains forty-one pages of letter press, illustrated by four full 

 page lithographic plates and five woodcuts. The pagination and the 

 numbering of the plates have been made consecutive with those of 

 Parts I. and II. by A. H. Foord and E. O. Ulrich. 



Part lY., to be issued shortly, will consist of an illustrated Report 

 on some Radiolaria from the Cretaceous rocks of Manitoba, collected 

 by Mr. Tyrrell. For this Report the Survey is indebted to the kindness 

 of Dr. D. Riist, of Hanover, Germany. 



ALFRED R. C. SELWYN. 



Geological Survey Department, 



Ottawa, August, 1891. 



