II. SUBKINGDOM ARTICULATA. 



General Characteristics. The Articulates (jointed) 

 constitute more than four-fifths of the Animal Kingdom. 



Fig. 3U6. 



An Articulate. 



The body is composed of a series of rings, formed of skin 

 more or less hardened and serving for a skeleton (Table, p. 13). 



Fig. SUl. 



Nervous System of Insects. 



Each segment generally has its nervous ganglion, which acts 

 independently as a kind of local brain. 



SUBKINGDOM. 



u 3 



f RESPIRATION BY TRACHEA OR PULMONARY 

 SACS. 

 RESPIRATION AQUATIC, USUALLY BY GILLS; 



RED; 



LEGS MORE THAN EIGHT. 

 WITHOUT JOINTED LIMBS. 



GLASSES. 



Insecta, Inseeta. 



j- Crustacea, Lobsters, 



CLASS. 



INSECTA. 



Vermes, Worms. 

 SUB-CLASSES. 



DISTINCT HEAD, THORAX, AND ABDOMEN; i Insecta \ F i iefs etc _ 

 WINGED, LEGS six. j proper, f 



SEGMENTS AND MMBS NUMEROUS, WINGLESS. Myriapoda, Centipedes, etc. 



HEAD AND THORAX UNITED, LEGS EIGHT, 

 WINGLESS. 



{ Arachnida, Spiders. 



