116 CETACEA. 



intestine : its duet enters the duct of the liver near its passing into 

 the gut 1 . 



The capsulae renales are small for the size of the animal when com- 

 pared to the human, as indeed they are in most animals ; they are flat 

 and of an oval figure. The right lies on the lower or posterior part of 

 the diaphragm, some way higher up than the kidney; the left lies lower 

 down by the side of the aorta, between the left kidney and that artery. 

 They are composed of two substances ; the external has the direction of 

 its fibres or parts towards the centre ; the internal seems more uniform, 

 not composed so much of fibres 2 . 



There is a small doubling or fold of the peritoneum running from the 

 middle of each ovarium towards the kidneys, as in most quadrupeds. 



There is but one bone to the sternum, which is at the upper part, 

 and only attached to the upper rib. This bone sends out two processes 

 laterally, which are attached to the upper edge of the first rib about 

 5 inches from the anterior end : the pointed part of this bone is the 

 lower part. As there axe neither length of sternum to oppose the ends 

 of the ribs, nor cartilages, the ends of the ribs are of course detached ; 

 but the space is filled up with strong ligamentous, tendinous, and 

 muscular substances intermixed, having a kind of middle tendon in 

 place of sternum. 



The two condyles of the occiput are very near each other, and a liga- 

 ment, which is attached to the concave surface of the first vertebra, 

 passes between the two condyles, like the falx between the two hemi- 

 spheres of the brain. 



The thorax is divided into two cavities by the mediastinum and heart, 

 as in the quadruped. The plexuses of the intercostal arteries 3 go between 

 two ribs near the articulations, and also communicate behind the liga- 

 mentous articulation of the rib with the vertebra?. 



The pericardium adheres by a broad surface to the diaphragm. The 

 diaphragm is almost entirely muscular, having no complete middle 

 tendon, but is tendinous in several parts, especially where the vena 

 cava passes through ; it is remarkably thick in its muscular coat. 



The brains in this class of animals vary very much in size from one 

 another, when compared to the size of the animal. In the porpoise I 

 believe the brain is the largest, and it is, perhaps, nearest the human 

 [brain] in size of any. The size of the cerebellum, in proportion to the 

 size of the cerebrum, is the smallest in the human subject of any : in 

 the common quadruped, as the cow or horse, the disproportion in size is 



1 [Hunt, Prep. No. 823.] 



2 ( lb. Nos. 1288, 1289 : the structure of the kidneys is shown in Nos. 1267, 1268.] 



3 [lb. No. 2058.] 



