648 ox THE L'ROGEXITAL ORaANS OF THE KAXGAEOO, 



specimen of H. ruJicolUs and in about the same region a similar 

 mass was found. All these are doubtless of like origin to the 

 bodies described by Prof. Owen. So far these are the only 

 examples met with by myself. 



Halmaturus dorsalis. — I have never met with any description 

 of, or allusion to, the urogenital organs, either of this species or 

 of the one next to be considered. Six specimens, of which one 

 was pregnant, were sent me, along with their skins by my 

 collector. In their general characters they are very much like 

 the organs of H. riiJicolUs, except that the lateral canals are 

 longer and make a wider arch than in the latter species. The 

 lateral canals are relatively as loug as in M. major and surpass 

 a. ruficoUis in this respect just as ISL. major does the Hed and 

 the Wallaroo. 



All these specimens shew the direct communication, its aperture 

 which has the usual situation, in every case being seen at once 

 on laying back the cut edges of the dorsal wall of the urogenital 

 canal. 



The urogenital passage in three specimens was damaged just 

 at the extreme end, but in three others it averages \^ in., and in 

 this respect agrees with S. ruficoUis. In all there is an arrange- 

 ment of ridges very similar to what has been described in the 

 last mentioned species. Sometimes however the median ridge 

 suddenly drops for iV in. between the orifices of the direct com- 

 munication and of the urethra, and the former may then appear 

 to be situated on a promontory with a free tip just as has been 

 described above in 0. rufus, and for the same reason. Occasionally 

 the median ridge disappears altogether immediately posterior to 

 the ostium urethr.T, or it may extend backwards for \ to \ in., 

 much as in II. rvjlcollh. In the latter species the marked 

 difference in level between the two orifices, and the extreme 

 shortness and sudden disappearance of the median ridge have 

 been met with less frequently than in II. dorsalis., though I do 

 not know tliat this is a point of any importance. 



