CONTENTS. 



HI.- 



Page 



VERTEBRATE ANIMALS, how characterized 211 



The Skeleton Composition of Bone 212 



Division of Vertebrate Animals into Four Classes ,,.... 212 



CLASS I. PISCES FISHES. 



Definition, and Distinctive Characters 213 



Distribution. Extremes of Temperature at which they live 213 



Form i ts great variety Change by Inflation 214 



Covering Scales Mucus Brilliancy of Colour 215 



Bony plates of the Trunk-fish and Pipe-fishes 216 



Senses Cirri, Organs of Touch 217 



Taste Smell -Hearing Sight 218 



Blind-fish Absence of Eyelids Colours of the Eyes 218 



Locomotion Swim-bladder its Uses not universal 219 



Caudal-fin other Fins how named 220 



Variety of Movement observed in a Pipe-fish 221 



Flying Fish 222 



Eespiration Heart Gills What kills a Fish when out of Water 223 



Food Some Fishes live on Vegetables, but most of them on Flesh 223 



Beneficence of this Arrangement Voracity of Fishes 225 



Teeth their Variety, Uses, and Numbers 227 



Reproduction 228 



Preservation of Vitality in the Ova 228 



Distribution, Geographical also according to Zones of Depth 229 



Number of Ova Instances of Parental Care of the Spawn 229 



Means of Escape, Defence, and Attack 230 



Uniformity of Colour Flight Spines 230 



Weapons of the Spined Dog-fish 232 



Weapons of the Stickle-back, Saw-fish, and Sword-fish 233 



