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 Gillrakers 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. 



L. F. DE BEAUFORT. 



Eerbeek, Holland, November 1913. 



