IV 



Page 



Chapter 4. — The Nervous Sj-stem 66 



The Brain C6 



The Cranial Nerves 68 



Chapter 5.— The Skin 73 



Dermal Canals and Sense Organs 74 



Minute Sti-ucture of the Skin, Dermal Tubes, and Sense Organs .... 79 



Chapter 6. — Embryology 84 



Chapter 7. — Structure of Fhyllundla solevs 93 



PART III. 



BlONOMICAL. 



Chapter 1. — Geographical Distribution 99 



Chapter 2.— Habits, Food, &c. 101 



Food 105 



Parasites 108 



Enemies 109 



Chapter 3. — Colour 110 



Chapter 4. — Breeding 114 



Chapter 5. — Development and Growth 119 



PART IV. 



Economical. 



Chapter 1. — Artificial Propagation 129 



Chapter 2.— The Sole Fishery 137 



Chapter 3. — Practical Measures . 142 



