238 RODENTIA. 



the edge of the liver ; the ductus cysticus is long, on account of the 

 situation of the gall-bladder, and runs along a groove in the liver to 

 the ductus hepaticus. The posterior edge of the epiploon is attached to 

 the transverse branch of the pancreas. 



The spleen has a dent in which the upper end of the kidney lies. 

 There are two venae cavae superiores. 



The lungs are larger on the right side than on the left. On the 

 right side they are divided into three lobes, besides the middle one ; the 

 left lung has only one lobe. The uvula is like a nipple projecting 

 equally on all sides. 



The clitoris is on the inside of the vulva. The uterus is not rugous. 

 There are two ora tincse. The capsula ovarii is large, with a small 

 opening 1 . 



[Family HELAMIDjE."] 



Forster's Jerboa [Helamys Capensis, Cuv. 2 ]. 



The oesophagus is about an inch long below the diaphragm. The 

 duodenum passes to the right side, being attached to the upper surface 

 of the transverse turn of the colon, passes down the right side as low 

 as the ileum, then makes a turn upwards and towards the left, behind 

 the mesentery, where it gets upon the edge of the mesentery and 

 becomes the jejunum. The ileum gets behind the lower end of the caecum 

 and adheres to it, and is attached to it as far as its entrance into that 

 gut. The caecum lies in the direction of the abdomen, its beginning 

 being as low as the pelvis ; thence it passes upwards upon the right of 

 the mesentery and terminates in an obtuse curved end. The colon 

 begins at the lower end, winds round the beginning of the caecum, and 

 follows it upwards nearly its whole length, being attached to it through 

 its course by a narrow mesocolon. However, at the lower and the 

 upper ends, it is in- contact [with the caecum] and attached to it by its 

 surface. The colon, where it leaves the caecum, makes a little convolu- 

 tion, then a fold upon itself about five inches long : from that part it 

 crosses the spine, attached as before mentioned : it then makes a short 

 turn, about an inch long, upon itself, passing down the left side to the 

 pelvis : in this last course it becomes a loose intestine, having a broad 

 mesocolon 3 . The small intestines are about five lengths of the animal 

 from nose to anus. 



1 [The preparation of the female organs, ascribed in the Hunterian MS. Cata- 

 logue to "Mr. Banks's Nick," shows the above characters: No. 2749, Phys. Catal., 

 4to, vol. iv. p. 161.] 



2 [The skeleton of this animal is No. 2252, Osteol. Series.] 



3 [Home, Comp. Anat. toI. i. p. 456 (Jerboa).] 



