NOTICE. 



In the preface to Decade III., already published, the reason has 

 been given why the present one, though second in time, is first in 

 number. In the same preface it has been stated that the present 

 Decade, confided for the descriptions to Mr. J. W. Salter, palaeon- 

 tologist to the Geological Survey of the United Kingdom, is intended 

 to illustrate a commingling of forms heretofore supposed to belong 

 to distinct epochs; that the drawings are by Mr. Bone, and the 

 engravings by Mr. Sowerbt, artists well known for their accuracy 

 and skill. 



W. E. LOGAN. 



Montreal, 11th April, 1859. 



