61 



PERIPLANETA 



15. The remaining organs of the same cockroach as seen after the removal of the alimentary canal 

 and fatty body. Cerebral ganglion ; sub-cesophageal ganglion, closely attached to the cerebral and 

 representing three fused ganglia (those of the mandibular and two maxillary segments); ist, 2nd, and 

 3rd thoracic ganglia; ist abdominal ganglion; 2nd to 5th abdominal ganglia; 6th and last abdominal 

 ganglion. In FEMALES. Colleterial glands ; oviduct ; spermatheca ; ovarian tubes. ' In immature MALES. 

 Testis as a somewhat transparent lobed body lying on each side in the fat immediately below the 

 4th and 5th terga; vas deferens as a slender duct passing back to the small mushroom-shaped gland. 

 In adult MALES. Mushroom gland (vesicula seminalis); short duct of same; accessory gland. 



1 6. Ovarian tube under low power of microscope. 



17. Contents of the mushroom gland and spermatheca. Spermatozoa. 



1 8. Malpighian tubule under high power. 



19. Muscular fibre under high power. 



