INDEX. 



573 



Echinodermata— continued. 

 Cake-urchins 



Sea-eg-g's .... 

 Their mode of climbing 

 Complicated structure of shell 

 Sea-cucumbers . 

 The cottou-spiuner 

 Siphou-worms 

 Sipunculus bernhardus 



CHAPTER VIII, 



Entozoa ''Parasitic Worms) 

 Hydatid . 

 Tape-worms 

 Flukes 

 Guinea-worm 

 Hair-worm 

 Turbellaria 

 Planarias . 

 Long; sea-worms . 



CHAPTER IX. 



Second Grand Division of the Animal Kingdom : — 

 Articulated animals 



under great diversity of cir 



Includes creatures existin 

 cumstances . 



Their external conformation the most obvious ch 

 of distinction 



Worms 



Centipedes. 



Insects 



Scorpions, spiders, &c. 



Crabs, lobsters, &c. 

 First Class of Articulated Animals 



Annelida — Worms 



Divided into three orders 

 Abranchiate 

 Dorsibranchiata 

 Tubieola .... 

 First Order: — 



Abranchiate annelidans 



Divided into two ftimilies 



Setigera and suctoria , 



Earthworms 



Tlieir importance in the economy of nature 



Naides 



Leeches 



Medicinal leech . 

 Second Order : — 



Dorsibranchiato annelidans 



Their splendid appearance 



Their variety of weapons 



iracter 



