BATRACHIANB, 



177 



producing a greater volume of sound Bwell oui on each 

 of the head of the males. Among the few viviparoue !'• - 

 trachiana known is an Alpine European salamander 

 i> atra) which brings forth its young alive. 

 Unlike young fishes, the yolk is entirely absorbed before 



", Axolotl,OT larval Salamander, -!i"«iii£ tin* trills, hi 

 branches and lungs (PA). P. pulmonary art >. pulmonary veins 



bulbus arteriosus, from which the vascular arclu riginate; 66, 1 



chiul vein; the lower .i. vena cava; V, descending aorta. 



the tadpole leaves the egg. In warm climates the tadpoles 

 hatch in four or five days after the eggs are laid. When 

 hatched the tadpole is nol so well developi 

 voung fishes. The digestive canal at firs! is simple and 



straight. Afterwards it b( remarkably lung, and 



