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 ofl' eleven pairs of intercostal arteries, the 



Text-fig. 12. 



Intrathoracic aorta of Suricata tetradacti/la . 

 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 arteiy of 

 the pair arising separately from the aorta : important because in 

 some mammals (e. g. Ghinchilla) the intercostals arise as single 



