RHINOCERO TID.E 



407 



and reference has already been made to the resemblance between 

 the visceral anatomy of these species. 1 The form of the stomach 

 is very similar to that of the Horse. The liver (Fig. 171) has a 

 comparatively large caudate lobe, but is chiefly remarkable for the 

 peculiar shape of the Spigelian lobe, which mainly consists of a thin 

 strip of tissue, 8 inches long, f- inch wide, and \ inch deep. The 

 small intestine, in place of the villi of //. unicornis, has throughout 

 the greater part of its length a uniform series of thin and nearly or 

 quite continuous transverse foldings, like the valvulse conniventes 

 of the human small intestine. There is no gland behind the foot. 



re 



Fig. 171. — Posterior aspect of the liver of Rhinoceros sumatrensis. re, Right central lobe ; 

 rl, right lateral lobe ; le, left central lobe ; 11, left lateral lobe ; c, caudate lobe ; sp, Spigelian 

 lobe. (From Garrod, Proc. ZooL Soc. 1S73, p. 102.) 



The post-glenoid and post-tympanic processes of the squamosal do 

 not unite below the auditory meatus. The presence of a lateral 

 nasal diverticulum, like that of the Horses and Tapirs, has been 

 verified only in this species, although it doubtless occurs in the 

 others. 



Atelodine Group. — In the adults the incisors and canines quite 

 rudimentary or entirely wanting. Nasal bones thick, rounded and 

 truncated in front. Well-developed anterior and posterior horns in 

 close contact. Skin Avithout any definite permanent folds. 



The tAvo Avell-marked existing species are peculiar to the African 

 continent. 



1 For the internal anatomy of R. sumatrensis see Garrod, Proc. Zool. Soc. 

 1873, p. 92 ; and Beddard and Treves, loc. cit. 



