714 ON THB ANATOMY OF rETEOGAXE XANTHOPDS. [June 16, 



the two portions of gut are connected by a fold of peritoneum 

 which reaches almost to the extremity of the caecum. 



The Genito-urinary System. 



The male genito-urinary organs answered so well to Owen's 

 description that 1 refrain from making any remarks about them. 



The Mespiraiory System, 



The Larynx is remarkable for the great size of the arytenoids, 

 which, as Owen points out \ are situated at the side instead of on 

 the dorsal surface. The part of these cartilages which points 

 towards the head of the animal is a broad convex border instead of 

 forming the apex of a pyramid ; from the anterior end of this 

 border the short vocal cords pass to the thyroid. There are no 

 false vocal cords or ventricles. The epiglottis is large, and is 

 deeply notched in the middle of its free edge. The ventral part of 

 the anterior edge of the thyroid cartilage curls over towards the 

 cavity of the larynx and forms a little pouch just behind the stalk 

 of the epiglottis. 



The Trachea is a little over 4 inches long ; the cartilaginous 

 rings form rather more than complete circles, so that one end 

 overlaps the other on the dorsum ; this arrangement allows a 

 considerable dilatation of the tube. 



The Thyroid Qland is described in the account of the vascular 

 system. 



The Lunys are remarkable, as is usual in Kangaroos, for the 

 small amount of lobulation which they exhibit. The right lung is 

 much larger than the left and has a well-marked azygos lobe ; 

 from the ventral border of this lung a long triangular process 

 projects, in front of which are two notches. The left lung lias 

 one notch on its ventral border, but, like the right, is undivided by 

 fissures. Owen ' states that in Macropus major the right lung 

 has two notches in its anterior (ventral) border, while the left is 

 undivided; va. M. parryi both have one or two notches ; in another 

 Kangaroo he found the right lung divided into four lobes and the 

 left into two. On neither side is there any eparterial bronchus. 



' 'Anatomy of Vertebrates,' vol. iii. p. ."iS-t. 

 - ' Anatomy of Vertebrates,' toI. iii. p. 677. 



