Vlll 



CONTENTS 



PAGE 



Keproductive Organs . " 108 



Larva , . . 110 



Ecdysis . . . Ill 



CHAP. VII. INSECTA 



114 



Blatta ... 



External Characters . 114 

 Segments and Appen- 



dages . . .115 



Internal Structure . 118 



Alimentary Canal . 118 



Respiratory Organs . 119 



Circulatory System . 120 



Nervous System . 120 



Excretory Organs . 122 



Body Cavity . . 122 



Reproductive Organs. 122 



Development . . 123 



Insects and Disease . 124 



Gnats and Mosquitoes . 125 



Tse-tse Fly. . . 127 



General Considerations . 128 



Body Cavities . . 128 



Fate of Blastopore . 129 



Endocrinology . .130 



CHAP. VIII. CEPHALOCHORDA 



Amphioxus . . .132 



External Morphology . 132 



Internal Morphology . 134 

 Connective Tissue and 



Myotomes . .134 



Notochord . . 134 



Alimentary Canal . 135 



Atrial Cavity . . 138 

 Coelom Myocoel 



and Splanchnocoel 138 



Circulatory System . 139 



Nervous System . 140 



Excretory Organs . 141 



Reproductive Organs. 142 



Development . . 142 



CHAP. IX. PISCES 

 Raia . . . .153 



External Characters . 154 



Scales . 157 



PAGE 



Internal Structure . 158 

 Skeleton . . .158 

 Alimentary Canal . 163 

 Respiratory Organs . 166 

 Coelom . . .167 

 Vascular System * . 168 

 Endocrine Organs . 173 

 Nervous System . 174 

 Sense Organs . .179 

 Urinogenital Organs . 185 

 Development . .190 



CHAP. X. AMPHIBIA 



Rana . . ; . 195 



External Characters . 196 



Internal Structure . 197 



Skeleton . . .197 



Alimentary Canal . 205 



Respiratory Organs . 207 



Coelom . . .207 



Vascular System . 209 



Endocrine Organs . 214 



Nervous System . 215 



Sense Organs . . 219 



Urinogenital Organs . 221 



Development . 4 225 



CHAP. XI. THE DEVELOPMENT 

 OF BIRDS AND MAMMALS 



Birds 

 Mammals 



234 



247 



CHAP. XII. MAMMALIA 



Lepus 



External Characters 

 Internal Structure 



Skeleton . 



Alimentary Canal 



Respiratory Organs 



Coelom 



255 



256 

 256 

 256 

 274 

 279 

 281 



Vascular System . 282 



Endocrine Organs . 290 



Nervous System 291 



Sense Organs . . 300 



Urinogenital Organs . 305 



Germ Cells . . .310 



Index 315 



