RHINOCEROTIDAE 407 
and reference has already been made to the resemblance between 
the visceral anatomy of these species! 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, ? inch wide, and 4 inch deep. The 
small intestine, in place of the villi of 2. wnicornis, has throughout 
the greater part of its length a uniform series of thin and nearly or 
quite continuous transverse foldings, like the valvule conniventes 
of the human small intestine. There is no gland behind the foot. 
u SS) 
Fic. 171.—Posterior aspect of the liver of Rhinoceros sumatrensis. re, Right central lobe ; 
rl, right lateral lobe ; lec, left. central lobe ; 1, left lateral lobe; c, caudate lobe; sp, Spigelian 
lobe. (From Garrod, Proc. Zool. Soc. 1873, 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 Grouwp—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 without any definite permanent folds. 
The two well-marked existing species are peculiar to the African 
continent. 
1 For the internal anatomy of R. swmatrensis see Garrod, Proc. Zool. Soc. 
1878, p. 92; and Beddard and Treves, loc. cit. 
