RENAL AND REPEODUCTIVE SYSTEMS. -J 5 1 



along the outer borders of the ureters as a pair of 

 sinuous tubes with opaque walls. 



Their hinder ends are dilated into small 

 vesiculse seminales, which open into the cloaca. 



;j. The cloaca is a shallow cup-like depression into which 

 the rectum, ureters, and genital ducts open. 



a. The rectum opens in the ventral wall of the 

 cloaca. 



Slit up the rectii,m along one side, and note its opening into 

 the cloaca. 



b. The urino-genital pouch is a saccular diverticulum 



of the dorsal wall of the cloaca, separated from 

 the rectum by a transverse fold. The ureters 

 open into it dorsally and close to the middle line ; 

 and to their outer sides are the openings of the 

 vasa deferentia, on the apices of a pair of small 

 papillae. 



c. The posterior chamber of the cloaca is a thin -walled 



dilatation of the dorsal wall of the cloaca, behind 

 the urino-genital pouch, and close to the external 

 cloacal opening : into its dorsal surface a glan- 

 dular diverticulum, the bursa Fabricii, opens in 

 young birds, but is usually absent in the adult. 



B. The Female Pigeon. 



1. The renal system is the same as in the male. 



2. The reproductive system. 



a. The ovary. In the embryo a pair of ovaries are 



present, but of these the right one disappears 

 during development, and the left alone persists. 

 This is a large irregular-shaped body, suspended 

 in a fold of peritoneum opposite, and partly in 

 front of, the anterior lobe of the left kidney. 

 Numerous ova in various stages of development 

 project from its surface. 



b, The oviducts, The left oviduct is a wide convoluted 



ao2 



