233 ZOOTOMY. 



which are embedded in cavities furnished by the pelvis and 

 sacrum. 



2rs. The postcaval vein (vena cava inferior s. 

 posterior,) (Fig. S4,//f), a large vessel passing from between 

 the anterior ends of the kidneys to the posterior dorsal 

 region of the right lobe of the liver : it enters the substance 



lad 



Fig. 53. — Columba livia. The urinogeiiiial organs of an adult 

 female, ventral aspect ( x |). 



The peritoneum is removed, but the parts are in situ, except that the 

 left oviduct is partly uncoiled. 



(r/.2, middle, and (r/.3, posterior, compartment of cloaca : k, kidney ; 

 l.od, left oviduct : Led', its opening into cloaca : /, od', its funnel-like 

 anterior end : l.od", its opening into' ccelome : ov, ovary ; r.od, rudi- 

 mentary right oviduct : r.od', its opening into cloaca : ur, ureter : ttr', 

 its opening into cloaca. 



of that gland, and, emerging from its anterior border, passes 

 forwards to the heart (§ 246) : it is formed posteriorly by the 

 union of the two iliac veins (§ 218), which carry the 



