252 MARSUPIALIA. 



upper jaw agree with the hog ; those in the lower jaw, in number, with 

 the Scalpris-dentata ; hut, with regard to position, and probably use, 

 with the hog. The grinders would seem to be a mixture of the hog 

 and ruminants ; the enamel [is only] on their external surface, and the 

 grinding surface is rather formed into several cutting edges than points. 

 There are six incisors in the upper jaw, and only two in the lower ; but 

 these two are placed almost horizontally, so as to oppose the six in the 

 upper jaw. There are five grinders on each side of each jaw, the 

 most anterior of which is small, and probably is cast when the mouth 

 is full 1 . 



Of the Viscera. — The oesophagus passes into the stomach towards the 

 left. The stomach, at first view, is more like the transverse arch of the 

 colon in the human subject, than like a stomach : it reaches across the ab- 

 domen, making two slight convolutions like the letter oq , first down, then 

 up, and slightly bending down the right side, to its termination in the 

 duodenum : it has longitudinal bands like the colon in man and some 

 other animals. The duodenum passes down a little way on the right 

 side, attached to the back by a thin membrane, as also in front to the 

 ascending colon ; then makes a quick or short turn upwards, the bent 

 parts being connected by an intermediate mesentery ; it then crosses the 

 body behind the mesentery towards the left, and commences the jejunum : 

 the small intestine is strung upon the mesentery as far as the caecum, 

 and, when got to the right, rather passes up along the caecum to which 

 it is attached, and enters the caecum. The whole of the small intestines 

 are thin in their coats, and small in their diameter. The caecum lies in 

 the right loin ; it is pretty long, something like the appendix caeci in 

 the human. The colon passes up the right side before the duodenum, 

 attached to it by a thin membrane, as also to the right edge of the 

 mesentery ; it then crosses the body to the left. In this passage it is 

 attached to the back by a mesocolon, as also to the stomach by the 

 epiploon, which is short on the right side, and which attaches the colon 

 pretty closely to the stomach. It then passes down the left side very 

 loosely, having many convolutions with a broad mesocolon and meso- 

 rectum. The colon is not much larger than the other intestines, there- 

 fore it cannot be said to be a reservoir for the faeces. 



The small intestines were 5 feet long : the caecum was .... inches : 

 the colon and rectum were about 1 foot. This was a young animal 2 ; 



1 [The lower jaw of No. 1732 shows this number. For the homologies of the teeth 

 and phases of dentition in the genus Macropus, see the article ' Odontology,' in 

 Encyclopaedia Britannica, vol. xvi. (1858), p. 483.] 



2 [Probably the specimen from which the skull, showing the two deciduous and 



