No. 428.] THE ANATOMY OF A DOUBLE CALF. 609 
down alongside of the bladder and, passing out with the urachus, 
runs to the placenta. A second umbilical artery for each would 
be needed to complete two entire bodies; these are wholly 
wanting. There are two posterior vena cava, one for each 
body half, and similar renal veins were recognized. Posteriorly 
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ucts. wise anterior bladder has one os over 
; the 
Fic. 8. — The two bladders and ee 
f the posterior bladder: 
forward so as to show the anterior bee 
other letters as in Fig. 7. 
the venze cavae divide and give rise, after the manner of the 
aorta, to an iliac vein for each of the two paired hind legs. 
But the inner iliac veins run toward each other and meet and 
fuse, forming a single large communicating iliac vein, thus 
extending the list of posterior parts common to the two body 
ves. 
