461 
A number of instances have been noted in the dog where the 
iliacs unite to form the post cava in the region of the renal 
arteries and veins, the exact position varying in each instance, see 
McCLuRE, 00. : 
The common pigeon furnished one interesting abnormality. The 
injection was made through the large artery supplying the pectoral 
muscles. The usual amount of injection mass was forced into the ar- 
— Suprarenal veins. 
Eh ZEN N =\: Renal veins. 
In 
vo 
Vertebral arteries. | 
Fig. 2. Abdominal circulation of Cat, with variation. 
teries and no unusual resistence or sudden giving away of the resist- 
ance was noted at the time. On dissecting, it was found that the 
post cava and all of the veins emptying into it were injected as well 
as the usual arteries. The jugular and brachials were the only veins 
which were un injected. This result was obtained because of the pres- 
ence of an embryonic structure, the foramen ovale, which gave a large 
opening between the two auricles. An examination of the edges of 
the foramen showed that the opening was undoubtedly there before 
the injection was made. 
