viu CONTENTS. 



ClIAl-TER l.AOB 



Sec. 3. The Exo-skeleton of the Proboscis - - - 127 



a. General Morphology ■ - - -127 



b. The Sclerites and Morphology of the Proboscis of 



the Blow-P'ly - - - -134 



f. The Proboscis of the Immature Imago - ■ 148 

 d. Comparative Anatomy of the Proboscis in the 



Diptcra - • - - - • '49 



Si£C. 4. The Thoracic Exo-skeleton - - - - 1 54 



a. (Jeneral Morphology - - - - ' 54 



b. General Description of the Thoracic Skeleton of 



the Blow-Fly - - - - - 166 



c. The Sclerites of the Thoracic Skeleton - - 171 



d. Details of the Exo-skeleton of the Legs - - 190 



e. The Wings and Mechanism of Flight - - 198 

 Sec. 5. The Exo-skeleton of the Abdomen - - - 209 



a. General Morphology .... 209 



b. The Abdominal Skeleton of the Blow-Fly - - 210 

 Appkndix TO Chaptkr v.— Methods of Study - - - 211 



VI. The Topographical Anatomy ov the Muscles and 



Vlscera ov the Imago - - - ■ - 215 



VII. The Embryology of the Blow-Fly in the Egg - - 230 

 Sec. I. Early Changes in the Ovum subsequent to Fertilization 



and ^'ormation of the Blastoderm - - 230 



„ 2. Formation of the Membranes and Primitive Band - 241 

 „ 3. Origin of the Archenteron, Somatopleure and Coelomic 



Sacs ------- 247 



„ 4. The Dorsal Organ of Kowalevski - - - 254 

 „ 5. The Nymphoid Stage of the Embryo, and its Con- 

 version into the Larva - - - 257 

 VIII. General Anatomy and Histology of the Blow-Fly - 262 

 Sec. I. Cells and Nuclei . - - . . 264 

 „ 2. The Parablastic Tissues . - . - 270 

 „ 3. Epithelia ------ 277 



„ 4. Muscles and Nerves ----- 282 



a. The Muscles - - - - - 282 



b. The Nerves ------ 288 



IX. The Development of the Nymph in the Pupa - - 292 



Sec. I. Formation of the Pronymph from the Lai-va - - 296 



a. Histolysis of the Larval Muscles - - - 297 



b. The Histolysis of the Hypodcrmis, and the For- 



mation of the Paraderm - - - - 299 



c. Relation of the Imaginal Discs to the Paraderm - 303 



d. The Contraction of the Paraderm and Evolution of 



the Discs - - - - - - 305 



