[ 159 ] 



xvr. 



AN ABNORMALITY IN THE ARTERIAL SYSTEM OF THE 



RABBIT. 



By EDMOND J. SHEEHY, A.RC.Sc.L, 

 Demonstrator in Zoology in the Royal College of Science, Dublin. 



(communicated by professor g. h. carpenter, m.sc.) 



[Read Novembeb 28. Published December 19, 1916.] 



Whilst working recently in the biological laboratory of University College, 

 Galway, my attention was drawn by Professor Mangan to an irregular 

 arrangement of the aortic branches in the blood system of a rabbit. I am 

 much indebted to him for having afforded me an opportunity of examining 

 this abnormality, and of giving an account of it. My thanks are also due 

 to Professor Carpenter for some valuable suggestions. 



The well-known normal arrangement of the rabbit's great arteries is 

 shown in figure 1. In the specimen now described the innominate artery 



Fig, 1. —Normal Arrangement of Blood-vessels in Rabbit. 



R.V. Right vertebral. 

 R.S. ,, subclavian. 



R.C. ,, carotid. 



gives off the two carotid trunks, but does not give 'rise to the right sub- 

 clavian. A blood-vessel, serving as a right subclavian, that is, supplying the 



SCIENT. PBOC. R.D.S., VOL. XV., NO. XVI. 



2d 



