1891.] 



TADPOLES OF THE EUROPEAN BATRACHTANS. 



595 



Discoglossidce, however, each ridge, or at any rate the second, bears 

 two or even three rows of teeth (fig. 1, B). 



The history of the accessions to our knowledge of the structure of 

 the beak and hps has been given very fully by Heron Royer and 

 Van Bambeke. In addition to the works of Schulze, Keiifer, and 



Fig. 1. 



m. 



B 



Open mouth of, A, Velodytea punctatus, B, Alytes obstetricans. 

 b.o, buccal orifice ; l.p, labial papillse ; in, mandibles ; t, series of labial teeth. 



Gutzeit, mentioned above, I would refer the reader particularly to 

 the following papers : — 



C. Van Bambeke. " Recherches sur la structure de la bouche 



chez les tetards des Batraciens anoures." Bull. Ac. Belg. (2) 



xvi. 1863, p. 339, pis. i., ii. 

 F. E. Schulze. "Ueber Cuticulare Bildungen und Verhornung 



von Epithelzellen bei den Wirbelthieren." Arch. f. mikr. 



Anat. V. 1869; p. 295, pi. xvii. 

 HfeRON Royer and C. Van Bambeke. " Sur les Caracteres 



