THE LIZARD. 169 



wall of the cloaca, and having a bilobed free anterior 

 extremity or fundus. 



178. The kidneys (Figs. 40 42, ), two dark, reddish- 

 brown bodies, situated between the dorsal wall of the pelvic 

 cavity and the rectum : their anterior ends are about on a 

 level with the corpora adiposa, their posterior ends reach 

 back a little beyond the level of the vent : they are irregular 

 in shape, adapting themselves to the form of the cavity in 

 which they lie, and their tapering posterior ends are closely 

 applied to one another : they are covered by peritoneum on 

 the ventral face only : each consists of two lobes, an anterior 

 and a posterior. 



179. The pelvic veins (Fig. 40, //) have already been 

 seen ( 138) attached to the edges of the corpora adiposa : 

 traced backwards, each is s^en to pass across the ventral 

 face of the corresponding kidney, and to be united with its 

 fellow to form a single trunk : this latter, which by its 

 bifurcation forms the pelvic veins, is the caudal vein (r) ; 

 it lies along the ventral aspect of the caudal vertebrae and 

 brings back blood from the various tissues of the tail. 



1 80. The principal renal portal vein, arising from the 

 pelvic vein at the point where it turns outwards across the 

 ventral face of the kidney: it enters the anterior lobe of the 

 kidney, supplying it with venous blood : the posterior lobe 

 is supplied by smaller renal portal veins springing from the 

 hinder part of the pelvic veins. 



181. The femoral (/?) and sciatic (st) veins, two 

 trunks, the former from the anterior, the latter from the 

 posterior region of the leg, and opening into the corres- 

 ponding pelvic vein. 



182. The two trunks which by their union form the 

 postcaval vein ( 173) : the right is considerably the 

 larger and is directly continued into the postcaval, while 



