PREFACE... 
THE first part of this Catalogue, containing the Toads and 
Frogs, or Tailless Batrachians, will shortly follow; but so 
many additional specimens of these animals have been re- 
ceived in the Museum since the MS. was put into type, 
that it is considered advisable to defer its appearance until 
they can be examined, and the new ones described. 
The part now printed contains the Tailed Amphibia, or 
Salamanders, Newts, and Sirens. 
MM. Duméril and Bibron have not yet described the spe- 
cimens of these families, and the death of M. Bibron, it is 
to be feared, has indefinitely deferred the appearance of the 
remainder of their work. 
J. KE. GRAY. 
British Museum, 
June 1. 1850. 
