XL] THE ALIMENTARY SYSTEM. 455 



Further subdivision is rare, though it may exist, as e.g. in 

 the Rodent Capromys, which has a liver consisting of many 

 very small lobules ; and in the Camel, which has numerous 

 small superficial lobules on that organ. In the Seals also 

 there are many secondary fissures. 



The left lateral lobe may be very little developed, as in 

 Semnopithecus. The same may be the case with regard to 

 the left central, as in the Noctule Bat. 



The right lateral lobe may be excessively small, as in the 

 Hare. The caudate lobe may be absent, and the Spigelian 

 quite rudimentary, as in the Wombat. 



FIG. 386. LIVER OF THE TWO-TOED SLOTH (Choicest] seen from beneath, its 

 front margin being turned upwards. 



(After Flower.) 



c, caudate lobe ; g, gall-bladder ; Ic, left central lobe ; re, right central lobe ; 

 rl, right lateral lobe ; s, s, enormous Spigelian lobe. 



The caudate lobe may attain a great size, as in the 

 American Ape Pitheda (where it is as large as any other 

 lobe of the liver), and in the Hedgehog. The Spigelian lobe 

 may take on an excessive relative development, as in the little 

 deer Tragulus, and above all in Cholaspus. 



The liver may be even more simple than in man, as in 

 the Dolphins, where it consists of two lobes only, and is very 

 small. It may, as in the Hippopotamus, have no fissures 

 whatever visible, the representative of the umbilical vein 

 running deep and enclosed in the substance of the liver. 



