CAVIA PORCELLUS. 207 



The epiploon is the same as in the hare. The liver is the same ; 

 there are a number of small fissures where the right lobe sends in the 

 lobulus Spigelii. The gall-bladder is as in the hare. I found two hepatic 

 ducts, but most probably there were many more, as this specimen had 

 become putrid. The pancreas is the same as in the hare. Kidneys are 

 similar. The capsulae renales are similar. The lumbar veins are the 

 same. The clavicle is the same, only that the end towards the sternum 

 is cartilaginous. The venae cavse superiores are the same. The arte- 

 ries from the aorta are similar. The lungs are the same. There are 

 two serotinus and but very little hair on them, much less than on the 

 white hare. 



The forms of the testicles and of the epididymis, with their attach- 

 ment, &c, are exactly the same. The whole male parts of generation 

 exactly similar \ 



[Family CAVIID^E.] 



The Guinea-pig \Cavia Porcellus, and C. Aperea, Erxl. 2 ] . 



They eat almost anything that is given to them, both animal and 

 vegetable food. They have only one vena cava superior. The oeso- 

 phagus below the diaphragm is as in the rat. The stomach is not a 

 very oblong cavity, but much as in many other animals : it is in the 

 common situation, and has a pretty quick bend at the small end, but 

 not so much so as in the squirrel. The duodenum is pretty large at the 

 beginning, is somewhat sacculated, becomes much smaller (but perhaps 

 this appearance is owing to the contraction of the pylorus on one side, 

 and the contractions of the duodenum itself beyond this swelling), then 

 becomes loose, and does not pass down the right side so low as usual ; 

 it only makes a kind of fold upon itself, and passes into the root of the 

 mesentery, where it adheres, passing a little way down something 

 lower than the lower end of the kidney, to which it is likewise 

 attached by a thin membrane. After this it is doubled upon itself 

 a little way, and then passes to the left behind the mesentery, a little 

 convoluted ; afterwards it becomes a loose intestine. The ileum seems 

 to pass into the caecum upon the left side (if I have not inverted them 

 by accident). These intestines are very small. The caecum is very 

 large, about 1J inch in diameter: it is thickest where the ileum is 

 inserted, as in the porcupine ; then it makes an arch downwards across 

 the brim of the pelvis, becoming smaller towards the right side, when 



1 [The female organs are shown in Preps. Nos. 2743, 2744 ; the foetus and mem- 

 branes in Nos. 3471, 3472.] 



2 [The skulls and teeth form Nos. 2004, 2006, Hunt. Osteol. Series.] 



