XIII 
the isthmus, there remains a free posterior margin, running 
as a fold over the isthmus from one gillopening to the other. 
The number of the Gzdllrakers as given by us, are those 
counted on the lower branch of the first gillarch; the most 
inferior are neglected if they are quite rudimentary. 
As already told, we follow the law of priority and use the 
oldest name which can with certainty be made out by the 
description belonging to a certain species. Its author is cited 
as the author of the species and his paper is quoted in the 
first place. 
Mention is further made of all synonyms; besides, we have 
quoted those papers, which contain a description of the species. 
If it is a widely spread one, only those papers are quoted, 
which contain a description of or give some informations — 
- others than those regarding locality only — about Indo- 
Australian specimens of that species. 
According to the international rules of nomenclature we 
have neglected the generic names, as e.g. those of SWAINSON, 
which are not accompanied by a description. 
Finally there remains for us the pleasing duty of expressing 
our sincere thanks to Mrs. C. J. DE BEAUFORT for her kind 
and valuable help in reading the proofs. 
Our thanks are also due to Prof. A. E. H. SWAEN of the 
University of Amsterdam for his linguistic advice so cordially 
given. 
Our recognition of indebtness must also include Mr. J. F. 
OBBES, whose ability as a zoological artist has enabled us 
to give a figure of at least each genus. 
MAX WEBER. 
fe E DE BEAUFORT: 
Eerbeek, Holland, November 1913. 
