110 Proceedings of the Royal Society of Victoria. 



Figure 7. 

 Ventral view, showing kidneys, testis, and bladder, and veins 

 associated vi'ith them. Approximately x 3^. 



Figure 8. 



Ventral view of abdominal aorta, showing the vessels of the 

 pelvic region. Approximately x 4. 



APPENDIX. 



June 18th, 1904. 



A more complete paper by Professor McClure on the Anatomy 

 of the venous system of Didelphys marsupialis^ (called in his 

 previous paper here referred to, D. virginiana) has come under 

 my notice, and it seems desirable to make some reference to it. 



(1.) McClure adds yet another to the list of Marsupials in 

 vv'hich there is a common internal iliac artery — in Petrogale^ (sp-'?) 

 as contrasted with Notoryctes (see Fig. 8). In Petrogale also, as 

 in Didelphys, there is a well marked median sacral artery such as 

 is not found in Notoryctes. Further, in Didelphys these arteries 

 appear to lie in general internal to the veins, sometimes dorsal, 

 and sometimes ventral to them, whereas in Notoryctes the 

 arteries lie external and generally dorsal, being rarely, if ever, 

 quite ventral to the veins. 



With these exceptions, the division of the abdominal aorta in 

 Didelphys into two common iliac arteries, and of these into 

 external and internal branches, is very similar to the condition 

 found in the Notoryctes, and quite unlike that found in Petrogale 

 among other Marsupials. 



(2.) It will be found that though some of the variations in tlie 

 relations of the iliac veins in Didelphys are very much like those 

 of Notoryctes (notably PI. II., Fig. 8, being one variation of 

 McClure's Type II.), yet even here Notoryctes differs from 

 Didelphys in the most posterior union of the common iliacs to 

 form the posterior veua cava, and also in the position of the 



1 Amer. Jour, of Aiiat., vol. ii., No. 3, 1903, p. 338, fig. vi. 



