40 



ElNAK LÖXXBEKG, 



than it has now and J do not think I err in placing this reduction in 

 connection with the choice of a different food or with other words 

 the change from a herbivorous or graminivorous diet to a carpopha- 

 gous one. 



Concerning the liver of the younger foetus (h.) it may be re- 

 marked that the caudate lobe is less developed than in the older stage 

 (i). It does not reach the margin of the right lobe and in consequence 

 of this the capping of the right kidney is almost as much effected by 

 the lateral or posterior portion of the right lobe as by the caudate lobe. 



The spleen of the foetus h. displays also quite an interesting 

 difference in shape when compared with that of the foetus i. In the 

 former it is not triangular as in the latter, but elongately elliptic, 

 rounded at both ends although somewhat broader at the outer poste- 

 rior end. It resembles thus more in its general shape the spleen of 

 Giraffa and Gervicornia although the same organ of these animals is 

 comparatively shorter. It seems from this, however, as I have ex- 

 pressed before 1 ), that the elliptic shape of the spleen is in the Bumi- 

 nantia an ancient characteristic and that the triangular ovine shape is 

 secondarily aquired. 



10) A young foetus of Gephalophus silvicultor <S measuring from 

 the forehead to the anus about 180 mm. and from the snout to the 

 occiput about 75 mm. It is perfectly naked as yet - not even a 

 bristle is seen — and may be regarded to represent almost the same 

 stage as that named b. of G. mélanorhoeus (conf. above). 



15 — 16 palatal elevations are developed and the four foremost 

 of those reach continually across the palate the others are arranged 

 more or less regularly in pairs. On the latter the crenulation of the 

 posterior edge is beginning to show. The continuity of the foremost 

 palatal ridges is a difference from the smaller species described above. 



The thymus-gland extends all the way from the heart up to 

 the larynx. In the thoracic cavity it is a rather thick body measuring 

 about 6 mm. across, but then it is continued as a narrow cord, IV2 

 mm. in diameter on either side of the trachea. On a level with the 

 thyreoidea and dorsally of the same it is again expanded to a thickness 

 of 3 mm., at the same time reaching a little beyond the thyreoidea. 



The latter gland forms a bean-shaped body on either side of 

 the trachea just behind the larynx. Its length is about 672, its breadth 



*) Proc. Zool. Soc. 1000. 



