IV 



Page 



Chapter 4. — The Nervous Sj-stem t>G 



The Brain GG 



The Cranial Nerves G8 



Chapter 5.— The Skin 73 



Dermal Canals and Sense Organs 74 



Minute Stracture of the Skin, Dermal Tubes, and Sense Organs .... 79 



Chapter 6. — Embryology 84 



Chapter 7. — Structni-e of Phylhmdla solece 93 



PART III. 



B 1 N M I C a L. 



Chapter 1. — Geographical Distribntion 99 



Chaiteb 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. 



E C N M I C A r,. 



Chapter 1. — Artificial Propagation 129 



Chaitkr 2.— The Sole Fishery 137 



Chapter 3. — Pi-actical Measures 142 



