DIDELPHIS DORSIGERA. 263 



which is about half an inch long ; the other portion, which is about 

 2 inches long, unites the. brown part to the penis, but becomes thinner 

 in its coats towards the penis : the light brown part is thicker in its 

 coats than the other, which makes a kind of swell at this part. 



The crura penis are not attached to the pubis, as in many other 

 animals, but are detached, and have their bodies and ends surrounded 

 with a muscle almost like a gizzard. There are two bulbs, like glands, 

 which are covered each with a muscle. There are two ' glandes penis,' 

 and two large Cowper's glands 1 . 



Quaere, As the bones from the pubis exist in the male as well as the 

 female, what is their use 2 ? 



The left jugular and subclavian veins pass down on the left of the 

 heart, and in this course it [left superior cava] receives the vena azygos 

 of the left side. 



The liver is divided into four lobes, all of which are united at their 

 bases. The gall-bladder lobe is the largest, the left is the next in size, 

 the first to the right of the gall-bladder lobe is the next, and the right 

 of all is the least ; there is no lobulus Spigelii, excepting what the right 

 lobe forms by being continued a little way to the left of the vena cava 

 inferior : the reason of that would seem to be owing to there being no 

 curve between the entrance of the oesophagus and pylorus to be filled 

 up by this lobe. 



The ducts of the liver are the cystic, which is straight, the hepatic 

 and the common duct, which is pretty long, and which enters the duo- 

 denum about an inch and a half from the pylorus ; which would be, in the 

 human subject, 5 or 6 inches, as the animal is not so large as one's 

 hand from which this description was taken 3 . There were vessels, 

 besides the common duct, filled with bile, between the liver and a gland 

 lying behind the duodenum : they had valves that hindered a return of 

 the bile to the liver. 



The oesophagus is about 2 inches in length below the diaphragm. 

 The stomach is globular, not oblong, as in the human subject ; and the 

 oesophagus enters about the middle between the two ends, more like 

 that of a hare, or animals of the vegetable-feeding kind 4 . 



The duodenum passes to the right, and then down ; but soon crosses 

 the spine to the left, where it becomes loose as common ; it is therefore 

 not so long as in most quadrupeds, yet has a mesoduodenum. The ileum 

 terminates in a colon on the right side as in the human subject. The 



1 [Hunt. Preps. Physiol. Series, Nos. 2471, 2472, 2473, 2479, 2481.] 



2 [See Phil. Trans. 1834, p. 334.] 



3 [Probably the Didelphis dorsigera, Phys. Series, No. 3777.] 

 * [Hunt. Prep. Physiol. Series, No. 541.] 



