1890.] 



TEKTH IX A TAILLESS BATRACHIAN. 



665 



tailless Batrachians most forms are provided with teeth on the 

 vomers, whilst but a few have any upon either the palatines or 

 the parasphenoid. Among Reptiles, a distribution of the teeth on 

 as many as three elements (pterygoids, palatines, vomers) is only 

 known in two forms — a Rhynchoeephalian and Lacertilian. It 

 is a fact that the Batrachians generally agree with the Fishes in 

 the sequence in which the teeth of the palate are usually lost, 

 viz., in the following order: — (I) Pterygoid, (2) Parasphenoid, 

 (3) Palatine, (4) Vomer ; whilst in the Reptilia we find great 



