OMNIVORA — URINO-GENITAL SYSTEM. 379 



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 



Fig. 141. 

 Liver of a Hog— posterior view, o, Right external lobe ; 6, Eight 

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

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

 duct : k, Ductus Cholcdocus. 



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, which is flat anteriorly, and 

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

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

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

 round the nasal openings. 



The nasal fossae are long and narrow. The frontal sinuses extend back- 

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

 the hyhoid heel processes by the epiglottis rather than by the thyroid cai-ti- 

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

 The trachea 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 Icidnexj is large, simple "e 



in form, and like that of the Fio. 142. 



horse externally. The urini- Horizontal section of the kidney of a Hog. o, Cortical 



ferous tubes discharge by ^^8ta°<=e; h. Medullary substance; c, B^nal papillae; d, 



mi Infundibulum ; c. Ureter cnt across, 

 papillae and cahces. The 



ureters enter the bladder very near together ; the bladder itself is large, pro- 

 jecting considerably into the abdomen. 



