106 GENERAL B10LOOJ. 



3. The kidneys : elongated red masses close to 



the vertebral column. 



4. The adrenal bodies : a band of yellow tissue on 



the ventral side of each kidney. 



5. The ureters : two whitish tubes passing from 



the outer edge of the kidney to the cloaca 

 In the male : 



1. The testes : a pair of yellowish rounded 



bodies. 



2. The genital ducts (vasa efferentia) placing 



each testis in communication with the 

 kidney of the same side. In the male the 

 ureter serves also as a genital duct. 



3. The kidneys, as in the female (see above). 



4. The adrenal bodies, as in the female (see 



above). 



5. The ureters, as in the female (see above). 

 Diagram of the Reproductive Organs ! 



VI. The Nervous System. 



A. The Central Nervous System. 

 Cut the skin along the median dorsal line and 

 turn it back. Remove the muscles from the 

 vertebrae. Open the neural canal by cutting 

 the membrane between the skull and the first 

 vertebra. Remove the roof of the brain-cavity 

 gradually, bit by bit, with small strong for- 

 ceps or with small strong scissors. In the 

 same way remove the neural arches of the 

 vertebrce. 



