574 INDEX. 



Second Orders-continued. PAGE 



Sand-worm ........ 92 



Nereids ......... 92 



Singular structure of mouth. . . . . .92 



Erroneous notions concerning worms .... 93 



The sea mouse ..." 93 



Third Order: 



Tubicolous annelidans 95 



Serpulse . . 95 



Shells of serpulcB . ...... 95 



Singular trap-door ....... 95 



Terebellse . . .95 



Construction of their residence 96 



CHAPTER X. 



Myriapoda 96 



Intermediate between red-blooded worms and insects . 97 



Structure of myriapods ...... 98 



Myriapoda remarkably distinguished from insects, pro- 

 perly so-called 98 



Two families belong to this Class ..... 98 



Millepedes and centipedes . . . . . .98 



Millepedes, how distinguished ..... 98 



Their habits 98 



Centipedes . 99 



Their formidable mouth 99 



Giant scolopendra ....... 99 



Forked centipede . . . . . . .100 



Electric scolopendra 100 



CHAPTER XI. 



Insects 100 



How to study insects . . . . . . .101 



What is an insect 102 



Three principal portions of body 102 



Divisions of leg of insect , . . . . .103 



Wings of insect . . . . . . . .104 



Diversity in construction of instruments for procuring 



nourishment ....... 105 



Mouths of insects divided into two classes . . . 10"> 

 Their formation . . . . . . .11)6 



Organs of sense in insects . . . . . .107 



Eyes of insects . . . . . . . . 108 



Respiratory system of insects ..... 109 



Admirable contrivance for preserving the flexibility of 



their air tubes 110 



Extraordinary strength of insects . . . .111 



No insect in its winged condition permitted to grow . 112 

 Metamorphosis of insects . . . . . .112 



Order Coleoptera . . . . . . . 116 



Characteristics of coleopterous insects . . . .116 



