SEX-CHARACTERS ILLUSTRATED 63 



The cock has his spur and larger comb and 

 wattles; the prairie cock has an inflatable 

 bare orange-coloured sac on each side of the 

 neck ; the turkey-cock has his large spur, and 

 the fleshy process on his forehead, pendulous 

 but erectile, is larger than in the female ; the 

 male huia of New Zealand has a short, strong 

 and nearly straight bill, while that of the 

 female is much longer, more slender, and 

 curved; the great bustard has an inflatable 

 throat pouch at the breeding season. 



In Reptiles sex-dimorphism is not usually 

 striking, but there are some good illustrations 

 among lizards. The male of the American 

 chamseleon (Anolis) has an erectile crest 

 along the back and tail, and some male 

 chamaeleons have bony projections in front 

 of the eyes. Among Amphibians the male 

 newts have more brilliant colours and crests 

 on their back and tail, but only, it is said, in 

 those species in which the male does not 

 clasp or embrace the female. In male frogs 

 and toads there are often swollen cushions 

 or pads on the hand, which are of service 

 in grasping the female. In some cases, as 

 in the common edible frog of the Continent, 

 the male has resonating sacs formed as 

 pouches from the lining of the mouth, and 

 in Rhinoderma darwinii these are much 

 enlarged and form a receptable for the eggs ! 

 The eggs laid by the female are taken by the 

 male into his mouth and pass to the sacs 

 where they develop into small frogs. In Noto- 

 trema, a tree-frog of tropical America, there 

 is an interesting occurrence of a structure 

 peculiar to the female, namely, an egg-pouch 



