NOTICES OF NEW BOOKS. 39 



which appeared in zoological literature towards the end of the 

 last century, we may well take heart and fresh courage. 



A separate issue of seventeen beautifully coloured plates 

 accompany the volume for those who wish to acquire the same, 

 and we trust that the author may have health and strength to 

 finish the colossal undertaking. Meanwhile, as years must elapse 

 before the whole of these volumes can be issued, it would be 

 advantageous to the classificatory scheme of the author, and 

 most useful to workers who would fall in line with the classifi- 

 cation, if the names of existing genera under new family arrange- 

 ments could be published elsewhere, and at an early date. 



