202 MR. F. E. BEDDARD ON THE [Feb. 19, 



A male Macropus giganteus showed an almost exactly similar 

 arrangement of the several azygos veins. On the right side the 

 vein was strongly developed and passed back to the pelvic region, 

 givnig off a branch to the vena cava posterior in the region of the 

 kidney. On the left side one vein arose from the vena cava 

 anterior sinistra which apparently corresponds to the two which 

 arose separately in Macropus dorsalis. This vein was formed of 

 two affluents only. 



A female Macropus rufus possessed a well-developed azygos 

 upon the right side, which however did not extend backwards to 

 anywhere near the pelvic region. I traced it to the eleventh rib, 

 between which and the tenth lay its terminal branch. The vein 

 supplied all the intercostal spaces between this and the fifth 

 anteriorly. On the left side of the body was a rudimentary azygos 

 of two branches lying between the fourth, fifth, and sixth ribs. 

 A second example, a male, showed an identical arrangement of 

 both azygos veins. 



Macrop)us alligatoris is pi-ecisely like Macro2yus rufus. In a 

 m.ale specimen of this Kangaroo the well developed azygos lay 

 upon the right side of the body, while on the left side was a rudi- 

 mentary vein formed of two affluents only. 



Exactly the same description is to be given of Macropus 

 antilopimbs. 



Of Macrojnis derhianus I have had the opportunity of seeing 

 three individuals. Two of these were of particular interest since 

 they were mother and daughter. The female foetus showed two 

 azygos veins very nearly equal in extent, but the right was rather 

 longer than the left ; this discrejDancy — it will be observed — being 

 the usual one. On the other hand the parent showed reverse 

 conditions ; the left azygos was longer than the right, and in show- 

 ing this character was unique among the examples of this genus 

 which I have examined up to the present. But in a third specimen 

 of the same species, adult and a male, the azygos veins were as 

 nearly as possible equal, the left being again a trifle the longer. 



In Halmaturus bennettii I found the azygos on the left side 

 to be distinctly longer than that of the right side. I counted in 

 fact seven afiluents on the left side. On the right side there 

 were only five branches, of which the first followed the fifth rib. In 

 a second specimen (text-fig. 70), a male just out of the pouch, the 

 small left azygos had only three affluents from ribs 4 to 6. The 

 right azygos began with an affluent from rib 2. 



Of the genus Dendrolagus I have examined only one species, viz. 

 D. bennettii. In this Tree-Kangaroo I found the azygos to be 

 present only on the left side. 



j'Epyp>rym7ius rufescens is a species which shows difierences in 

 the proportions of the two azygos veins. In one example, a female 

 the left azygos was shorter, composed of four affluents ; the right 

 reached to the diaphragm. In a male the right was very much the 

 shorter, composed as it Vv'as of only two affluents. On the left 

 side there wei'e four or five brandies before the vessel disappeared 



