The present report, on Vertebrata from the Mid-Cretaceous rocks of the North-west 

 Territory of Canada, forms the second part of a " series of descriptive and illustrated 

 quarto memoirs " begun in 1891. 



The first part, by the late Professor E. D. Cope, is on " The species from the 

 Oligocene or Lower Miocene beds of the Cypress Hills ". 



The publication of a contemplated second part on the Vertebrata of the Laramie 

 formation of the North-west Territory, also by Professor Cope, was prevented by his death 

 in 1891. 



The Survey is deeply indebted to Professor Henry Fairfield Osborn, Curator of 

 the Department of Vertebrate Palteontology of the American Museum of Natural 

 History, New York, for having kindly consented, at the request of the late Dr. Greorge M. 

 Dawson, to supervise the working up of the vertebrate fossils in its possession. This 

 assistance has been given quite gratuitously by Professor Osborn, who, besides having 

 twice visited Ottawa in this connection, has also devoted some time to the consideration 

 of the more general geological and palasontological relations of some of these fossils, as 

 set forth in his introduction. 



In the preparation of the present report Mr. Lambe has had the advice and super- 

 vision of Professor Osborn. 



EOBERT BELL. 



G-EOLOGicAL Survey Department, 



Ottawa, 30th July, 1902. 



