Contents. xi 



CHAPTER XIII. 



PACK 



Bristled- Worms Earth-Worms Summary of Normal 

 Worms 70 



CHAPTER XIV. 

 Aberrant- Worms Moss-Polyps and Tunicated Animals . 74 



CHAPTER XV. 



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

 I. Arm-footed Molluscs; Class 2. Bivalves . . 78 



CHAPTER XVI. 



Class 3. Head-bearing Molluscs : Whelks, Snails, &c. . 84 



CHAPTER XVII. 



Class 4. Cuttle-FishesNautili and Squids Summary ot 

 Characters of the Classes of Mollusca .... 90 



CHAPTER XVIII. 

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



CHAPTER XIX. 

 Class I. Crustacea : Crabs, Loboteis, Shrimps, &c. . 98 



CHAPTER XX. 



Class 2. Spiders, Mites, and Scorpions . . . 108 



