112 BRANCH ARTHROrODA 



Order 11. Diplop'oda. — These are myriapods with dorsally 

 convex bodies. Each apparent segment, beginning with the 

 fourth or fifth, bears two pairs of appendages. There are no 

 poison fangs. The antennae are short and few jointed. This 

 order includes the miUipeds. An example is lulus. They 

 are found under old stumps or about rotten logs. Their food 

 consists usually of decaying vegetable matter, but some forms 



Fig. 84. — Class collecting insects. 



feed upon growing plants, otherwise they are harmless. They 

 have a habit of rolling up into a helix-like coil when disturbed. 

 They are bisexual. When hatched the young have but three 

 pairs of legs. " By successive molts new segments and append- 

 ages are added " until the adult form is reached. 



CLASS IV. INSEC'TA 



This class of Arthropoda comprises a very large number of 

 species. Three hundred thousand, according to Kellogg, are 

 known. 



