ARVICOLA AMPHIBIA. 229 



this appearance was produced by the unequal thickness of its coats. 

 All the left portion, and that part of the right side placed between the 

 constriction above mentioned and the oesophagus, had their coats thin 

 and transparent like the tendinous centre of the diaphragm. These 

 thin membranes were terminated at the constriction of the right side, 

 and on both sides of the convexity on the anterior aspect, by a fringed 

 margin; all the rest of the right portion had its membranes much 

 thicker, and had a very apparent villous coat. 



The small intestines were of the same diameter from one extremity 

 to the other ; the csecum was very long, and transversely furrowed ; it 

 was nearly of the same dimensions throughout, except at its very end, 

 which was smaller than the rest. The colon at its origin equalled the 

 csecum in size, but its circumference diminished gradually for the space 

 of 2 inches, after which it remained the same for 9 inches further ; and 

 along this portion of the colon oblique fibres were perceptible, placed at 

 a distance of half a line from each other, none of which were visible 

 upon the other portion of the colon, which was nearly of the same size 

 as the rectum. 



The liver 1 was composed of six lobes; that which was placed in the 

 middle of the diaphragm was divided into two nearly equal portions by 

 a deep fissure, into which the suspensory ligament was inserted ; the 

 gall-bladder was attached to the bottom of this fissure. The largest 

 lobe was on the left side, and this covered the left portion of the middle 

 lobe ; the third was on the right side, behind the upper part of the 

 right portion of the middle lobe, to which it was much inferior in point 

 of size, but was a little larger than the fourth lobe, which was placed 

 behind it, and embraced the anterior part of the right kidney. The fifth 

 and sixth lobes were the least of all ; they were attached to the left 

 side of the root of the liver, one extending below and another above 

 the middle of the stomach ; these two lobes were much smaller than in 

 the rat. The liver was of a reddish-brown colour, which was deeper 

 externally than within. The gall-bladder was ovoid. 



The spleen presented three surfaces ; it was oblong and broader at 

 the inferior than at the superior extremity ; its colour was reddish, but 

 rather lighter than that of the liver. 



The pancreas formed three long and slender branches ; one ran along 

 the duodenum, the other along the left side of the stomach, and a third 

 towards the left side under the spleen ; between the second and third 

 branches was a fourth, placed upon the upper part of the stomach, and 

 there branching. 



1 [Hunt. Prep. No. 808.] 



