100 Proceedings of the Royal Society of Victoria. 



lingual and facial arteries are much farther apart than is very 

 often the case. Also, the facial here arises quite independently 

 of the temporal artery as contrasted with Choeropus.^ 



The internal carotid, as previously stated, gives off immediately 

 beyond its origin from the common carotid, the ascending 

 phalangeal artery, a condition to be contrasted with the 

 normal origin of this artery from the external carotid trunk. 

 This internal division of the carotid trunk runs down deeply, 

 external at first to the external branch until it lies close along- 

 side the pneumogastric nerve and the superior cervical ganglion, 

 and passes forwards between the muscles to enter the skull. 



The varying relations of the subclavian artery to the main 

 aorta have already been described. The vertebral artery appears 

 to be similar in position to that of other marsupials, but is 

 generally very small, and often invisible. The inferior thyroid 

 artery and its branches are, compared with their usual propor- 

 tions, very slender, especially when contrasted with the internal 

 mammary artery, which often approaches the main subclavian 

 artery in size. The deep cervical and superior intercostal 

 arteries leave the subclavian trunk separately, the latter being- 

 proximal to the former. 



The long thoracic, posterior scapular and subscapular, are all 

 normal in po.sition but of considerable size. 



The brachial artery divides early into ulnar and radial 

 branches : the relative position of these to each other, and to 

 the nerves and muscles of the forearm, conform in general to the 

 usual mannnalian type, as do also the branches and palmar arch 

 of the large median ulnar artery, so far as they could be made 

 out either by dissection or by sections. Here, as contrasted with 

 the majority of marsupials, the ulnar branches pass over the 

 condyle of the humerus instead of piercing it. 



The thoracic aorta passes round dorsally to the left bronchus, 

 find then posterioi-ly, in close contact with dorsal wall of the 

 thorax, to which it gives oif a few very small vessels, then 

 piercing the diaphragm to enter the abdomen. 



Abdominal aorta.— This gives off the coeliac artery, which 

 is long and divides into well-marked gastric, splenic and 



1 Parsons : Jour. Linn. Soc. Lend., Zool., vol. xxix., No. 188, 1903, p. 64. 



