applied himself to the work, its publication precedes that of 

 Volumes 24, 25, and 26. However, it will be followed imme- 

 diately by Volume 25, which contains the Gulls and Petrels, while 

 it is a matter of regret that no such prospect can be held out as 

 regards the other two volumes. In a final volume it is intended 

 to give a supplementary list of the species described since the 

 publication of the several volumes, and an Index to the whole 

 work. 



ALBERT GtJNTHER, 



Keeper of the Department of Zoolo(jy. 

 British Museum (N. H.), 

 September 6, 1890. 



