THE AORTA OF THE RABBIT 
307 
artery in two cases is a branch of the vertebral, while the super- 
ficial cervical which is normally a branch, of the transverse scapu- 
lar, in one case (Fig. 10) leaves the subclavian as a common stalk 
with the intercostal and mammary arteries. 
In three cases a small so-called thyreoid ima is present and in 
these this passes forward from its origin between the two common 
carotids, thus having the same morphological position in the 
rabbits as a similarly described vessel occupies in the human. 
references 
1. Bensley, B. A., Practical Anatomy of the Rabbit, 2d edition, pp. 256- 
257, University Toronto Press, 1918. 
2. Parker and Haswell, Text-Book of Zoology, 2d edition, vol. 2, pp. 
464-465, MacMillan Co., 1910. 
3. McMurrich, J. P., Morris’ Human Anatomy, 4th edition, pp. 510-511, 
P. Blakiston’s Son & Co., Philadelphia, 1906. 
Department oe Zoology and Entomology, 
Iowa State College- 
