1909. | POSTCAVAL VEIN IN MAMMALS, 515 
posterior spermatic veins flow into the postcava quite far back 
near to the bifurcation of that vein. They are quite symmetrical. 
Between the influx of the left renal above and of the spermatic 
veins below I counted four unpaired intercostal trunks. The 
iliac veins were asymmetrical, as is shown in the drawing (text- 
fig. 137), the internal arising as one trunk from the left external 
iliac. 
Text-fig. 137. 
Postcaval vein and its branches in Microcebus smithii (A) and Lemur catta (B). 
Ao. Aorta. Other lettering as in text-figs. 132, 133. 
In so far as concerns the Rodentia, the Rabbit is naturally very 
well known * ; and Hochstetter has furthermore called attention T 
to several variations in the venous system as affecting the tribu- 
taries of the postcaval. On the whole, it would appear that the 
* Krause, ‘ Anatomie des Kaninchens,’ Leipsic, 1884; Haswell & Parker, * Text- 
book of Zoology,’ London; aud many similar works. 
+ Morph. Jahrb. Bd. xx. pp. 585, 586, figs. 7, 8, 9. 
