THE INVERTEBRATES 



247 



180. ANIMAL LIFE DISTRIBUTION 



The distribution of animal life is regulated, or governed, 

 by climate and the physiography of the land. Some animals 

 are fitted to live in warm, and others in cold, climates. Each 

 class is thus confined to its own locality. Mountains, oceans, 

 large bodies of water, and deserts, prevent the distribution of 

 animals, and we would expect to find distinct species in iso- 

 lated districts. We have learned from travelers that this 

 is the case. 



References : 



1. 1304:353-366. 



2. 1503:312-316. 



a. 1204:12-16. 



b. 1301:165-186. 



c. 1302:364-367. 



d. 1303:332-372. 



e. 1305:313-327. 

 /. 1305:328-349. 

 g. 1306:135-148. 



h. 1307:302-312. 



i. 1308:120-123. 



j. 1309:292-310. 



k. 1310:473-480. 



I. 1311:332-345. 



m. 1312 : 400-439. 



n. 1508:236-242, 



Distribution of Animals. 



Adaptation of Mammals. 



Geological Control of Life. 



Distribution of Animal Life and Plants. 



Animal Geography. 



Distribution of Animals, Plants, and Man. 



The Various Forms of Life. 



The Distribution of Life. 



Geographic Distribution of Animals and 



Plants. 



The Dispersal of Life. 

 The Organic Environment. 

 Distribution of Animal Life. 

 The Environmental Relations of Animals. 

 Geographic Conditions of Life. 

 Geography of Plants and Animals. 

 The Distribution of Animals. 



181. THE INVERTEBRATES 



All animals come under two general heads : Invertebrates 

 and Vertebrates. The latter have a backbone made up of 

 sections called vertebra, while the former either have no bony 



