Contents. 



CHAPTER XIII. 



PAGE 



Bristled-Worms Earth- Worms Summary of Normal 

 Worms 7 



CHAPTER XIV. 



Aberrant- Worms Moss- Poly ps and Tunicated Animals . 74 







CHAPTER XV. 



Sub-kingdom 6. Mollusca or Soft-bodied Animals : Arm- 

 footed Molliiscoids ; Bivalves . . . . 78 



CHAPTER XVI. 



Head-bearing Molluscs : Whelks, Snails, c. . . 84 



CHAPTER XVII. 



Cuttle-Fishes Nautili and Squids Summary of Characters 



of the Classes of Mollusca ...... 90 



CHAPTER XVIII. 



Sub-kingdom 7. Jointed Animals or Arthropoda . . 96 



CHAPTER XIX. 

 Crustacea : Crabs, Lobsters, Shrimps, &c. . .98 



CHAPTER XX. 

 Spiders, Mites, and Scorpions ...... io3 



