52 



No signs of aortic branches to the degenerate pronephros. 



The blood-supply in Chryseniys is interesting as helping to 

 establish additional testimony to the theoretical conclusions arrived 

 at in this paper. 



The following points are of importance: 



1, The blood-vessels arise at a later ontogenetic stage than do 

 the tubules, and develop from before backwards. 



2. There is no convincing proof that the aortic branches have 

 any relation to the metamerism in the anterior region of the pronephros, 

 although signs of an arrangement related to the bod3'-segments is 

 noticeable further back. 



