X INTRODUCTION TO ZOOLOGY 



CHAPTER IV 



PAGE 



Phyldm III. : PORIPBBA ....... 52 



Different types of Sponge, their affinities ; classification ; direc- 

 tions for practical work. 



CHAPTER V 



PhTLDM IV. : ECHINODERMATA 60 



Class 1. Asteroidea. — The Starfish, Sunstars. Class 2. OpM- 

 uroidea. — -The Brittle-stars. Class 3. Eohinoidea. — Sea- 

 urchins. Class 4. Solothuria. — Sea-cucumbers. Class 5. 

 Crinoidea. — Sea-lilies. Eohinoderm development. Classifica- 

 tion ; directions for practical work. 



CHAPTER VI 



Phylum V. : Annelida . . . . . . .71 



Class 1. Chaetopoda, Sub-class Oligochaela. — Earthworms ; 

 their action on the soil. River- worms. Directions for. prac- 

 tical work. 



CHAPTER VII 



Phylum V. : Annelida {continued) . . . . .83 



Class 1. Chaetopoda, Sub-class Polychaeta (the Bristle- 

 worms of the sea). — The Paddle-worm, Sea-mouse, Lug- 

 worm, Sand Mason, Comb-worm, Sabella, Serpula, Pomato- 

 ceros, Spirorbis. Class 2. Hirudinea. — The Horse Leech, the 

 Medicinal Leech. Affinities of worms. Classification of Anne- 

 lida ; directions for practical work. 



CHAPTER VIII 



Phyla VI., VII., VIII., and IX.: Platyhelminthes, 



Nbmatoda, Polyzoa, and Eotifera . . .94 



Platyhelminthes. — Whirl - worms, Liver - flukes, and Tape- 

 worms. Nematoda. — Thread-worms. Polyzoa. — Sea-mats and 

 Corallines. Eotifera. — Wheel Animalcules. Classification ; 

 directions for practical work. 



