204 



THE GENERAL ANATOMY OF GORILLA 



[sect, a 



The division of the lungs offers no points of contrast with the 

 human type, though the Orang-utan is completely aberrant, viz. in 

 the absence of all divisions. In the Gorilla, the lobus azygos is 

 occasionally present. 



Here the thymus may be mentioned. It is said to be volu- 

 minous in the foetus at the fifth month, but its disappearance 

 seems to be more rapid than in Man. 



J. Alimentary Canal. The lips of the Simiidae are very 

 mobile as may be judged from the lifelike 

 sketch by M. Millot, reproduced as Fig. 134. 

 But the effect is somewhat masked by the 

 thickness of the lips and their incomplete 

 eversion (Fig. 135). In such respects the 

 Simiidae still resemble the Cercopithecidae, 

 even though a slight advance may be noted 

 in the disposition of the orbicular muscle- 

 fibres. 



The tongue is long and narrow (Fig. 136), 



the relation of its width to its length being 



as 1 to 3 - 6 (Ehlers). Thus it is strongly 



contrasted with the human tongue, and the 



contrast is enhanced by the remarkable 



filiform papillae (Fig. 137) near the root. 



The tongue of the Chimpanzee (Fig. 138) Fig- 135. Sections of 



, , „ ,, , , upper and lower lips of a 



approaches that of Man much more nearly y0U ng Gorilla. (Mus.Anat. 



in these characters. Cant.) 



In the tongue of the Gorilla, five circum vallate papillae were 

 observed by me, but the precise position of the foramen caecum 

 was obscured. The tonsils are well developed and in general the 

 superior laryngeal aperture may be said to resemble that of Man or 

 of the Chimpanzee, while the corresponding region in a large adult 

 Orang-utan provides an extraordinary contrast with all the pre- 

 ceding examples (Fig. 139). 



On the ventral aspect of the tongue, a lingual fraemim recalls 

 the corresponding fold in the human mouth. Two other folds are 

 situated symmetrically, one on each side of the fraenum, but 

 I cannot identify these definitely with the plicae fimbriatae. 

 Palatal rugae are well marked. 



