\^^JJ4\^^ CONTENTS 



Pagb 

 Preface v 



PART I 



CHAPTER I 



Introduction 1 



Ontogenetic Development — The Cell — Types of Cleavage in Animal Eggs. 



CHAPTER II 



A Type of Embryonic Development in Insects 9 



CHAPTER III 



The Egg, Fertilization, Maturation, and Cleavage 24 



The Egg of the Eutracheata — Fertilization and Maturation — Cleavage in 

 the Eggs of Eutracheata. 



CHAPTER IV 



Early Development 33 



The Blastoderm — Yolk Cells — Secondary Yolk Cleavage — Germ Cells — 

 Germ Band — Segmentation— Appendages. 



CHAPTER V 



Embryonic Envelopes, Dorsal Organs, and Blastokinesis 49 



The Embryonic Envelopes — Dorsal Closure — Cuticular Envelopes — Pri- 

 mary Dorsal Organ — Secondary Dorsal Organ — Indusium — Subserosa — 

 Blastokinesis. 



CHAPTER VI 

 Gastrulation, Formation of the Germ Layers, and Development of the 



Entoderm 65 



CHAPTER VII 



The Alimentary Canal 81 



CHAPTER VIII 



Ectodermal Derivatives 93 



The Integument — Endoskeleton — Glands — Tracheal System — Oenocytes — 

 Nervous System (Ventral Nerve Cord, Stomatogastric System, Brain, 

 Sense Organs) — Imaginal Disks. 



CHAPTER IX 



Mesodermal Derivatives 112 



Coelomic Sacs — Musculature — Definitive Body Cavity — Circulatory System 

 —Blood Cells— Pericardial Cells— Paracardial Cell Strand— Fat Body— 



ix 



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