PREFACE. Ill 



Zoological Society' (1884, 18S5, 1891), to illustrate 

 papers of mine, and have been copied with the sanc- 

 tion of the Committee of Publication of that Society. 



The figures in the text have been drawn by Mr. J. 

 Green, and reproduced by the Typographic-Etching 

 Company. Most of them are original ; if copied from 

 other works, the source has in every case been referred 

 to. A few cuts illustrating a paper by me on Tadpoles 

 in the c Proceedings of the Zoological Society ' for 1891, 

 and another by Dr. Ridewood on the development of 

 the hyoid, published in 1897, have been reproduced 

 by permission, for which I beg to tender my acknow- 

 ledgments to the Committee of Publication of the 

 Zoological Society. 



1 also wish to publicly express my thanks to Sir 

 W. H. Flower, K.C.B., and to the Rev. Professor 

 Wiltshire for the interest they have shown in the 

 publication of this work; and to the various friends 

 and correspondents who have assisted me with notes 

 or material, especially Dr. W. G. Ridewood, to whom I 

 am indebted for many hints and preparations ; M. F. 

 Lataste, who has placed his private collection at my 

 disposal ; Dr. J. de Bedriaga, Count M. Peracca, Mr. 

 F. A. Moller, Dr. F. Werner, and Herr W. Wolter- 

 storff, who have supplied me with an abundance of 

 living specimens from France, Italy, Portugal, Austria, 

 and Germany ; and Messrs. Chevreux and Doumergue, 

 through whose kindness I have been able to make 

 observations on a large number of living specimens of 

 Discoglossus from Algeria. 



G. A. B. 



British Museum (Natural History) ; 

 October 28th, 1897. 



