( cxli ) 



ative of their species. When I have spoken of the scent- 

 seales as absent, it may simply be that I have been unable to 

 find them ; when they have appeared to be scanty, it may be 

 that the particular specimen examined has happened to have 

 lost them ; and othei' sources of error may very easily exist. 

 Nevertheless, I may be peimitted to feel with some degree of 

 confidence that mvich of what I have put before you is both 

 new and true, and that a path of research has been opened 

 which may be followed up with good hope of both interesting 

 and valuable results. 



