28 MR. F. E. BEDDARD ON THE [May 2 
he gives no account of the vascular system at all. The innominate 
first gives off the left carotid, and then very shortly after divides 
into the right subclavian and right carotid. The aorta in the 
thoracic region gives off eleven pairs of intercostal arteries, the 
Text-fig. 12. 
Intrathoracic aorta of Suricata tetradactyla. 
Lettering as in text-fig. 11. 
eleventh being just in front of the diaphragm. It is important 
to notice that these arteries are paired throughout, each artery of 
the pair arising separately from the aorta: important because in 
some mammals (e. g. Chinchilla) the intercostals arise as single 
