821- NATATORES. 



The caeca were very long, as in the swan, and the coats thinner than 

 in the other intestines. The length of the whole intestines was four 

 times the length of the whole animal, and more than six times the 

 length of the trunk. The length of the rectum was about sis inches, 

 which is two-thirds of the length of the animal. The liver is divided 

 as usual. The ducts enter at the third duodenal turn, pretty close to 

 one another; and there are two pancreatic ducts that enter with them. 

 There was very little bile in the gall-bladder. The ovarium is as 

 common. The oviduct is a small cavity above the anus. 



The Moscovy Duck [Anas moschata, Linn.]. 



This bird has a crop, but not of that sudden swell as in the common 

 fowl. The gizzard is as in a swan. The duodenum is as usual. From 

 the last turn of this gut the jejunum passes back on the right side, and 

 then makes a short fold upon itself, having an intermediate mesentery ; 

 it then becomes a loose intestine : however, this loose part forms a 

 kind of scollop or short folds. After this the gut is folded upon itself 

 three times, which makes six portions of intestine lying parallel to one 

 another ; they are all connected to one another at the root of the 

 mesentery, but are single folds at the other end ; and indeed one fold 

 is almost single for its whole length ; these are parallel in direction 

 with the body. After this the intestine passes back and becomes 

 rectum, which becomes larger and larger towards the anus, where is the 

 usual swell. The caeca are pretty long, about the length of the last 

 folds, and are connected to them. 



The gall-bladder does not lie upon the last turn of the duodenum, 

 but between its curve and the porta of the liver ; there are two ducts 

 as usual, but are shorter, because they both enter at the duodenal 

 curve. The pancreas consists of an anterior and posterior portion, have 

 two large ducts which enter by the biliary ducts ; besides which there 

 is a small one that enters the duodenum midway between the second 

 and third turn : it comes from the lower end of the posterior pancreas, 

 which is the largest one. The pancreases are loose at the lower end, 

 and do not go so low as the second turn of the duodenum. 



Parts of Generation. — In the dissection of these, the gut is not to be 

 slit, but the parts are to be dissected all round the anus. If injected, 

 the better. There are two glands above the tail as in all the duck kind, 

 each having a duct ; but I believe that if the duct was injected, we 

 might fill the tubes of the gland, for it appears to be in structure like 

 the kidnev of a horse. 



