188 



ANIMALS CLASSIFIED 



Classification of Amphibia 



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

 Tail persistent throu<>;h life. Examples : iiiud puppy, newt, salamander. 



Ordkr II. Anura. Tailless Amphibia, which undergo a metamorphosis, breath- 

 ing Ijy 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), 

 in bony case. No teeth or sternum 

 turtle, box tortoise. 



Order II. Lacertilia (lizards). Body 

 covered with scales, usually having 

 two-paired appendages. Breathe 

 by lungs. Examples : fence lizard, 

 horned toad. 



Flattened reptiles with body inclosed 

 (breastbone). Examples: snapping 



Box 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. 



