OMNIVORA URINO-GENITAL SYSTEM. 



179 



The liver of the hog consists of four chief lobes ; a right and left external, 

 and a right and left internal ; a small quadrate and a Spigelian lobe exist, the 



I'lo. 141. 



Liver of a Hog— posterior view, a, Eiglit external lobe; h, Eight 



internal lobe ; c. Left external lobe ; d, Left internal lobe ; e. Spigelian 



lobe ; /, Posterior cava ; g, Quadrate lobe ; h, Gall bladder ; i, Cystic 



duct ; k. Ductus Choledocus. 



latter being cleft by a fissure for the posterior vena cava. There is a gall 

 bladder, and the biliary and pancreatic ducts enter the intestine singly. 



RESPIRATORY SYSTEM. 



The anterior extremity of the nose is the snout, ^yhich is flat anteriorly, and 

 presents on each side the small, round nasal opening. Like the muzzle of the 

 ruminant, it is always damp in health. At the anterior extremity of the septnm 

 nasi is the small snout bone, os rostri, covered by cartilage which extends 

 round the nasal openings. 



The nasal fosste are long and narrow. The frontal sinuses extend Ixack- 

 wards to the parietal bone. The larynx is loose and mobile, being attached to 

 the hyoid heel processes by the epiglottis rather than by the thyroid carti- 

 lage. The epiglottis is very large ; the lateral ventricles are large but shallow. 

 The irrtc/iea and lungs resemble 

 those of the ruminant, and, as 

 in that animal, there is a third 

 bronchus ; the pleural sacs 

 are separated completely. 



Urino-genital System. 



The kidney is large, simple 

 in form, and like that of the 

 horse externally. The urini- 

 ferous tubes discharge by 

 papillre and calices. The 

 ureters enter the bladder very near together ; the bladder itself is large, prO' 

 jecting considerably into the abdomen. 



Fig. 142. 

 Horizontal section of the kidney of a Hog. a, Cortical 

 substance ; h, SleduUary substance ; c, Benal papillae ; d, 

 Infundibulum ; e, Ureter cut across. 



