5 :8 



COLLEGE ZOOLOGY 



Suborder i. Aglossa. — There are only a few toads in this 

 suborder; all of them are tongueless and belong to the family 

 Aglossid^e. Pipa amerkana inhabits the northern portion 

 of South America; Hymenochirus bcettgeri and Xenopiis lavis 

 are confined to Africa. 



The Surinam toad, Pipa amcricana (Fig. 434), has a peculiai 

 method of carrying its eggs. They are placed on the back ct 

 the female during copulation, are held there by a sticky secre- 

 tion, and are gradually enveloped by the skin. Within the 



Fig. 434. — The Surinam toad, Pipa amerkana. (From Mivart.) 



epidermal pouches thus formed the eggs develop and the tadpole 

 stage is passed ; then the young toad escapes as an air-breathing 

 terrestrial animal. 



Suborder 2. Linguata. — Most of the frogs and toads are 

 included in the six families of this suborder. 



Family 1. Pelobatid^e. — There are about twenty species, 

 called spade-foot toads, in this family. One genus, Scaphiopus, 

 with four species, occurs in North America. The spade-foot 

 toads are burrowing Amphibia, and usually have thick hind feet 

 provided with a sharp spur for digging. The spade-foots of 



