INDEX. 573 



Echinodermatn continued. r* r <v 



Cake-urchins ........ 70 



Sea-eggs 70 



Their mode of climbing . . . . . .71 



Complicated structure of shell ..... 72 



Sea-cucumbers ........ 72 



The cotton-spinner ....... 73 



Siphon-worms ........ 73 



Sipunculus bernhardus ...... 74 



CHAPTER VIII. 



Entozoa ( Parasitic Worms) . . . . 74 



Hydatid 

 Tape-worms 

 Flukes 

 Guinea-worm 

 Hair-worm 

 Turbellaria 

 Planarias . 

 Long sea- worms 



CHAPTER IX. 



75 

 75 



75 

 76 



76 

 76 

 76 



77 



Second Grand Division of the Animal Kingdom : 



Articulated animals ....... 78 



Includes creatures existing under great diversity of cir- 

 cumstances . . . . . . . .78 



Their external conformation the most obvious character 



of distinction 78 



Worms 79 



Centipedes 79 



Insects ......... 79 



Scorpions, spiders, &c. ...... 80 



Crabs, lobsters, &c. . . . . . . .81 



First Class of Articulated Animals ..... 84 



Annelida Worms ....... 84 



Divided into three orders 84 



Abranchiate 85 



Dorsibranchiata . 85 



Tubicola 85 



First Order : 



Abranchiate annelidans ...... 85 



Divided into two families ...... 85 



Setigera and suctoria ....... 85 



Earthworms . . . . . .85 



Their importance in the economy of nature ... 85 



Naides 86 



Leeches 86 



Medicinal leech ........ 86 



Second Order : 



Dorsibranchiate annelidans 88 



Their splendid appearance . . . . . .89 



Their variety of weapons ...... 90 



