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Show 28 MR. F. E. BEDDARD ON THE [May 2 Intrathoracic aorta of Suricata tetradactyla. Lettering as in text-fig. 11. lie gives no account of the vascular system at al . K:" j :v:,jeg first gives off" the left carotid, and then very s ioi y a e into the right subclavian and right carotid. le ao thoracic region gives oft* eleven pairs of intercostal arteries, Text-fig. 12. 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 |