40 



BREEDINC HABITS OF AMPHIBIA 



Bufo americanus pair exhibiting 

 the back-arch release mechanism. 



Oviposition of Bnfo americanus. 



(From Aronson 1944: Am. Mus. Nov. #1250. Artist Miss P. Hutchinson) 



XENOPUS LAEVIS , the South African clawed toad. This form has been classified as a 

 toad and as a frog, its skin texture being more that of the frogs and its breeding habits 

 more like the toad. It is found in Africa, from the Cape to Abyssinia, and measures 

 about 4 inches maximum in the adult stage. 



It is purely an aquatic form, with clawed toes, no distinct tympanic membrane, tongue- 

 less, single posterior median opening for the Eustachian tubes, dilated sacral vertebrae, 

 carnivorous, and has Siluroid appearing larvae. It is sluggish, never leaving the water 



