B. The Brain 142 



C. The Stomatogastric System 157 



D. Neurilemma 160 



E. Corpora Allata 161 



F. Degenerating Cells 164 



IX. Tracheal System, Endoskeleton and Hypo- 



dermis 167 



1. Tracheal System 167 



2. Tentorium and Mandibular Apodemes 175 



3. Hypodermis 179 



X. The Oenocytes 181 



XL Muscles, Fat Body and Circulatory System.. 189 

 XII. Sex Organs — Ovaries 213 



XIII. Alimentary Canal 220 



XIV. Yolk and Yolk Cells 230 



XV. Duration and Rate of Development 245 



XVI. Technique 251 



Summary 253 



List of Abbreviations 262 



Bibliography 265 



Index 273 



