A Text-book of Entomology / Including the Anatomy, Physiology, Embryology and Metamorphoses of Insects for Use in Agricultural and Technical Schools and Colleges as Well as by the Working Entomologist

by A. S. Packard

3. Layer of postretinal fibres.

4. Ganglionic plate. (Periopticon of Hickson.)

5. External chiasma.

6. External medullary mass. (Epiopticon of Hickson.)

7. Internal chiasma.

8. Internal medullary mass. (Opticon of Hickson.)

9. Optic ganglia and nerves.

10. Pedunculated or stalked body. (Mushroom body of Dujardin.)

11. Bridge of the procerebral lobes.

12. Central body.