Material for the Study of Rumlxaxts. 



V.) 



melanorhoeus, but it is interesting to find that, in striking contrast to 

 what was the case in G. melanorhoeus, descensus testiculorum already 

 has taken place, while this in the small species did not happen before 

 the foetus is quite hairy all over and almost ready to be born. This 

 difference is the more peculiar, as, of course, even at the end of the 

 foetal life, the large species, G. silvieultor, is more remote from sexual 

 maturity than the small one, G. melanorhoeus, which latter most pro- 

 bably becomes fully developed within a year, which cannot be assumed 

 concerning the large species. 



Another difference of a similar kind is shown therein that the 

 two teats on either side in the young foetus of G. silvieultor, although 

 sitting quite close together and almost touching each other, are quite 

 separate to the base. As is described above the teats of G. melano- 

 rhoeus arc developed from a common rudiment on either side and are 

 not in the male foetus fully divided into two before the foetus is hairy 

 all over and almost fully developed. 



The kidneys are not quite so simple as in the other species, 

 as, at least in this stage, the different cones may be distinguished al- 

 though they seem to have the tendency to fuse together and form 

 only one mamilla. This is not completed in this stage, but it might 

 follow in a later, although this cannot be ascertained. 



It is an important fact that in all the foetal specimens of these 

 three species of Cephalopkus I have found a pit between the toes, as 

 well of fore as of hind legs, leading into a small bag corresponding to 

 the sinus inter digitalis of the sheep. This pit and bag are better de- 

 veloped in the advanced foetal stages and they are thus no doubt 

 persisting structures in the adult of this genus. This fact tends to 

 indicate that foot-glands are, and probably have been, still more gene- 

 rally distributed among the Ruminants than they usually are believed 

 to be. It is even probable that where they are missing this is due 

 to reduction, rather than that they should have been acquired inde- 

 pendently in different genera. 



Nova Acta Reg. Soc. Sc. Ups. Ser. III. Impr. 26 /s 1903. 



7 



