. Journal of morphology . LDdl. Fig. 14. 75 Days. IE JOCRNAL OF MORrHOLOGI.—VOL. XX, No. 2. THE ORIGIX AXD EARLY HISTORY OF THE GERM-CELLS IN SOME CHRYSOMELID BEETLES. BY ROBERT WILHELM HEGNER. With 4 PAGE I. Introduction 231 II. Review of tlie Literature upon the Origin of the Germ-cells in the Insecta Introduction 232 1. Lepidoptera 2. Diptera 230 3. Heniiptera 243 4. Hynienoptera 5. 248 G. Coleopt^ra 7. Neuroptera 8. Dermaptera 255 0. Aptera III. Observations 1. The role-Disc 2. The Genesis of the Pole-Cells 258 3. The Histo
. Journal of morphology . LDdl. Fig. 14. 75 Days. IE JOCRNAL OF MORrHOLOGI.—VOL. XX, No. 2. THE ORIGIX AXD EARLY HISTORY OF THE GERM-CELLS IN SOME CHRYSOMELID BEETLES. BY ROBERT WILHELM HEGNER. With 4 PAGE I. Introduction 231 II. Review of tlie Literature upon the Origin of the Germ-cells in the Insecta Introduction 232 1. Lepidoptera 2. Diptera 230 3. Heniiptera 243 4. Hynienoptera 5. 248 G. Coleopt^ra 7. Neuroptera 8. Dermaptera 255 0. Aptera III. Observations 1. The role-Disc 2. The Genesis of the Pole-Cells 258 3. The History of the Pole-Cells until the Sex of the Em- bryo can be Recognized 205 IV. General Considerations 270 1. The Granules of the Pole-Disc 270 2. The Migration of tlie Primitive Germ-Cells in the Insecta. 270 A. The INIigration of the Pole-Cells through the Pole- Cells Canal 270 B. Vhe Migration of the Germ-Cells within the Embryo 278 C. The Method of Locomotion of the Germ-Cells .. 280 .3. The Origin and Early History of the
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