124 ARTIODACTYLA. 



passes to the diaphragm between the two mediastina, but adheres to 

 the left, so that the posterior mediastinum is double. 



The vena azygos passes up upon the left of the aorta, then crosses 

 the aorta below its curve, then wheels round the vessels of the lungs, 

 upon their upper side passes round the left auricle, and is pretty closely 

 attached to it like the left vein [vena cava superior] of a bird : it then 

 enters the right aiuicle. 



The thymus is very large, reaching as high as the thyroid cartilage. 

 The thyroid gland is of a triangular shape, placed before the upper part 

 of the trachea. One side is attached to the trachea, however, but loosely. 

 They have a digastric muscle, but it does not adhere to the larynx. 

 The epiglottis was above the palatum molle, which is very broad, but 

 has no uvula. The epiglottis has a muscle which arises from the os 

 hyoides, and is inserted into its upper convex surface, which raises it 1 . 



The parotid gland is large ; comes forward along the lower jaw ; and 

 its duct, which comes out near the anterior end, passes over the lower 

 jaw with the genial artery, and enters the buccinator muscle. There 

 are two puncta lacrymalia, which pass into the bone separately, on the 

 outside of the brim of the orbit, as in the deer. The lacrymal gland 

 lies at the inner canthus, and has one duct, which enters the cavity of 

 the tunica conjunctiva at the cartilage 2 . 



Of land-animals the hog-tribe appears to be some removes from the 

 ruminants ; at least they have some things in common with them : ex- 

 clusive of these things, they are, in all others, similar to no other animal 

 that I know of. 



The first of these, and [one of the] external parts, are the cloven feet. 



The stomach, although not a ruminant one, nor having the three pre- 

 ceding bags, yet has a part covered by a cuticle, which is not a digestive 

 part. 



The colon, although not coiled up as in the ruminants, and afterwards 

 continued along the mesentery, yet it is coiled up upon itself. 



The parts of generation in both male and female are a good deal like 

 [those of the niminants] ; but most so in the male ; there being no coty- 

 ledons in the female. 



They have a great number of young, which in general the ruminants 

 have not 3 . 



1 [Hunt, Preps. Nos. 1491—1493.] 



- [lb. (for structure of the eye) Nos. 1703, 1711 (for eyelids and lacrymal appa- 

 ratus), No. 1781.] 



3 [The peccari has commonly but two at a birth: see p. 127.] 



