394 DA VISON. [Vol. XI. 



equal to almost one-third of the distance between the fore and 

 hind limbs. The transition from stomach to duodenum is 

 readily recognized by the vast difference in the thickness of 

 the wall, that of the latter being very thin. The membranous 

 vascular folds increase in prominence and continue throughout 

 the entire intestine to the rectum. The intestine is for one or 

 two centimetres folded upon itself at two or three points in its 

 course. The pancreatic gland lies dorsalward of the posterior 

 half of the stomach, and for an equal distance along the duo- 

 denum. The liver extends from the region of the tenth to the 

 thirty-eighth vertebra, being almost twice as long as the stom- 

 ach. It is entire. The gall bladder lies near the caudal ter- 

 mination of the liver. The rectum consists of an abrupt 

 expansion of the digestive canal at a distance of four or five 

 centimetres from the cloaca. The internal wall of the rectum 

 is quite smooth. This portion of the canal passes gradually 

 into the cloaca, recognized only by its location and smaller 

 diameter. The cloacal region will be described in the discus- 

 sion of the urogenital apparatus. 



The Circulatory System. 



This system in Amphiiima is very much the same as in the 

 salamanders. The heart is surrounded by a very large sac, 

 through which may be seen the ductus cuvieri entering the 

 large auricle. The bulbus arteriosus is long, giving off an 

 aorta bow on each side. The carotids are exceedingly large. 

 The iliac arteries and veins are very prominent. The venae 

 revehentes are clearly visible in the kidneys. The portal vein 

 lies along the dorsal side of the liver, receiving its numerous 

 tributaries from the intestines, pancreas, and liver. The pul- 

 monary vein is distinctly visible, passing to the apex of the 

 lung on the external wall. Other features of the vascular sys- 

 tem are in common with the order of Urodeles. 



I shall not attempt a description of the nervous system, as 

 that has been admirably discussed by Dr. Osborn (8). 



