808 ON TIIE UROGENITAL ORGANS OF THE KANGAROO, 



(c.) These are the organs of a small female whose skin on the 

 flat measures 27 inches from the tip of the nose to the base of the 

 tail. Her skull shews but one premolar and two molars on each 

 side of each jaw. The pouch and teats were rudimentary and 

 the ovaries are destitute of corpora lutea. On these grounds in 

 conjunction with the examination of sections I conclude that she 

 had never brought forth young. 



Having cut off the upper part of the mesial cul-de-sac, the 

 lateral canals, and the lower part of the urogenital canal, the 

 intervening part was sectionized, beginning at its proximal end. 



The sections through the bottom of the cul-de-sac shew the 

 presence of a longitudinal septum. On getting further down the 

 sections still shew an aperture corresponding to that of the cul- 

 de-sac in the earlier sections. It is considerably wider from side 

 to side than the urethral aperture, through not quite so high 

 from above downwards. It very gradually narrows from side 

 to side until in sections in which the urogenital canal appears 

 it diminishes to a mere pinhole situated in the middle liue, 

 between the urethra and urogenital passage but slightly nearer 

 to the former and then finally disappears. Wishing to know 

 where this took place the succeeding sections were carefully 

 counted, until the meatus urinarius appeared, which was in the 

 thirty-fourth section after the disappearance of the pinhole. 

 In the last section in which it appears the hole is ■£$ in. from the 

 summit of the median ridge. 



In Luca's description of his young H. Bennettii he says that on 

 carefully slitting up the wall of the median cul-de-sac and that 

 of the urogenital passage towards one another, he found that 

 while there was no communication between the two cavities their 

 mucous membranes were separated from one another by a layer 

 of connective tissue, at most £ mm. thick. 



In Ins Lecons de Comp. Anat. Cuvier says, " en introduisant 

 un stylet dans cette partie (median cul-de-sac) qui n'est plus 



