PIGEON. 123 



(g) The internal iliacs, paired, to the pelvis. 

 (h) The caudal artery, the posterior continua- 

 tion of the dorsal aorta. 

 B. The pulmonary artries, to the lungs. 



Diagram of the arteries ! 

 N. B. Keturn here to II. 17 and 18. 



IV. The Excretory and Eeproductive Organs. 



Carefully remove the digestive organs, cu^ng 

 through the intestine about an inch from its 

 posterior end. 



1. The ovaries and oviducts, or testes and 



vasa deferentia. 



2. The kidneys, adrenal bodies, ureters. 



3. The cloaca. 



Slit open the rectum on the ventral side and 

 continue the cut into the cloaca. 



(a) Note the number of chambers into 



which the cloaca is divided. 



(b) Find the openings of the ureters on 



the dorsal side of the cloaca in the 

 urino-genital pouch. Also, the open- 

 ings of the genital ducts. 

 Diagram of excretory and reproductive organs ! 



V. The Nervous System. 



A. The Sympathetic Nervous System. 



1. A delicate cord running on each side close 

 to the vertebral column, with ganglia at 

 intervals. 



