IX. 



ON THE HOMOLOGIES OF THE LOBES OF THE 

 LIVEE IN MAMMALIA. 



In descriptions of the internal anatomy of rare animals, it is 

 usually easy, even without the aid of figures, to compare the 

 accounts given of the arrangement of their organs with the 

 arrangement of similar structures in animals more familiar to us. 

 To this statement the descriptions given of the lobes and lobules 

 of a multifid liver form an exception ; and the purport of this 

 paper is to furnish the zoologist with a convenient and readily 

 applicable system of nomenclature for the several divisions which 

 the liver may be found to present in the mammalian series. 



The umbilical vein of the foetus, preserved for us in the adult 

 in the so-called ' suspensory ligament,' furnishes us with our first 

 landmark. The lobe to which it is attached we may call the 

 ' suspensory lobe ;' it is very commonly, though not in the human 

 subject, trifid, — the suspensory ligament having one lobule to 

 its left, sub-equal with a second to its right, which is bounded in 

 that direction by the cystic fossa where the gall-bladder exists, 

 and this second lobule, the ' suspensory central,' having the third 

 lobule lying upon the right, between the indentation (when it exists) 

 for the gall-bladder and the free right edge of the entire lobe. 



The ' suspensory lobe ' overhangs the two other lobes into which 

 the mammalian liver is divisible. To the left it overhangs a lobe 

 which is very rarely if at all deeply incised or indented ; this lobe 

 we would call the ' left lobe.' The lobe which it overhangs to the 

 right is very frequently lobulated somewhat complexly. This ' right 

 lobe ' is divisible into three secondary lobules, the ' superior right 

 lobule/ the 'right kidney lobule,' and the 'lobulus Spigelii.' The 

 ' superior right lobule ' is frequently in relation with the pylorus, 

 and in some animals, as the rabbit, is deeply excavated for the 



