188 



ANIMALS CLASSIFIED 



CLASSIFICATION OF AMPHIBIA 



ORDER I. Urodela. Amphibia having usually poorly developed appendages. 

 Tail persistent through life. Examples: mud puppy, newt, salamander. 



ORDER 11. Anura. Tailless Amphibia, which undergo a metamorphosis, breath- 

 ing by gills in larval state, by lungs in adult state. Examples: toad and frog. 



Characteristics of Reptilia. 



These animals are char- 

 acterized by having scales 

 developed from the skin. In 

 the turtle they have become 

 bony and are connected with 

 the internal skeleton. Rep- 

 tiles always breathe by means 

 of lungs, differing in this 

 respect from the amphibians. 

 They show their distant re- 

 lationship to birds in that 

 their large eggs are incased 

 in a leathery, limy shell. 



The leopard frog, an amphibian. 



CLASSIFICATION OF REPTILES 



ORDER I. Chelonia (turtles and tortoises). Flattened reptiles with body inclosed 



in bony case. No teeth or sternum (breastbone). Examples: snapping 



turtle, box tortoise. 

 ORDER II. Lacertilia (lizards). Body 



covered with scales, usually having 



two-paired appendages. Breathe 



by lungs. Examples: fence lizard, 



horned toad. 







liox tortoise, a land reptile. (From 

 photograph loaned by the Ameri- 

 can Museum of Natural History.) 

 About one fourth natural size. 



The gila monster, a 

 poisonous lizard. 

 About one twelfth 

 natural size. 



