598 



MR. G. A. BOULENGER ON THE 



[Nov. 17, 



cells, the tadpoles of a few genera {Biscoglossus, Bomhinator, Pelo- 

 dytes) present a system of fine black lines, most apparent on the 

 caudal crests and the more feebly pigmented parts of the body, 

 which afford excellent characters for their identification. It is a fact 

 worthy of notice that when the end of the tail has been nibbled off, 



Fig. 3. 



A. Eaiia agilis. B. Pelod,ytes fimctatus, G. Alytes ohstetricans. 



these pigmentary lines are not reproduced on the regenerated portion. 

 These lines were first noticed in Bomhinator by Leydig (N. Acta 

 Ac. Leop.-Carol. xxxiv. 1868, p. 105, pi. ii. fig. xix.), in Bisco- 

 glossus by Lataste (Actes Soc. Linn. Bord, xxxiii, 1879, p. 304, 



