viii CONTENTS 



Page 



Order i. BARNACLES (Cirripedia) - - 417 



Order 2. BIVALVE CRUSTACEA (Ostracoda) Mussel-Shrimps 419 



Order 3. FORK-FOOTED CRUSTACEA (Copepoda) - - - 420 



Order 4. LEAF-FOOTED CRUSTACEA (Phyllopoda) 421 



Class 6. KING-CRABS (Xiphosura) - - - 422 



Structure of the King- Crab (Limulus). 



Class 7. SEA-SPIDERS (Pycnogonida) - - - 424 



CHAPTER IX 



STRUCTURE AND CLASSIFICATION OF SEGMENTED WORMS, 

 SIPHON -WORMS, WHEEL -ANIMALCULES, MOSS - POLYPES, 

 AND LAMP-SHELLS 



SEGMENTED WORMS (ANNELIDA) 



Class i. BRISTLE-WORMS (Chaetopoda) - - - 425 



Structure of the Sea-Centipede (Nereis), taken as a Type 425 



Order i. MANY-BRISTLED WORMS (Polychasta) - 429 



Order 2. FEW-BRISTLED WORMS (Oligochaeta) River- Worms, Earth- Worms 430 



Order 3. SIMPLE SEGMENTED WORMS (Archiannelida) Dinophilus, Poly- 



gordius 43 1 



Class 2. LEECHES (Discophora) 432 



SIPHON-WORMS (GEPHYREA) 

 Bristle-Tail (Echiurus), Siphon-Worm (Sipunculus) - - 433 



WHEEL-ANIMALCULES (ROTIFERA) 

 Structure of the Rose-coloured Rotifer (Philodina roseola) 434 



MOSS-POLYPES AND LAMP-SHELLS (MOLLUSCOIDA) 



Class i. MOSS-POLYPES (Polyzoa or Bryozoa) 436 



Sea-Mat (Flustra), Lace-Coralline (Membranipora), Plume Coralline (Pluma- 

 tella), Lophopus. 



Class 2. LAMP-SHELLS (Brachiopoda) 43$ 



Structure of a typical Lamp-Shell (Waldheimia). 



CHAPTER X 



STRUCTURE AND CLASSIFICATION OF FLAT-WORMS (PLATYHELMIA) 

 AND THREAD-WORMS (NEMATHELMIA) 



FLAT-WORMS (PLATYHELMIA) 



Class i. TAPE- WORMS (Cestoda) - 44 1 



Class 2. FLUKES (Trematoda) 443 



Class 3. PLANARIAN WORMS (Turbellaria) - 445 



