THE ANTELOPES AND OXEN. 177 



rounded, the frontal part is not, as yet, elongated, 

 and the crown portion still forms actually a part of 

 the upper covering of the skull. Only upon the 

 appearances of the horn-cores and the lengthening 

 of the frontal bones do we find the first indication 

 of the abrupt rising up of the main back wall. 

 The calf is therefore still antelope-shaped as 

 regards the formation of its skull, as is shown in 

 Fig. 27, where the whole length of the parietal 

 bones are still to be seen from above, and the horn- 

 cores do not occupy the backmost or outermost 

 corner of the frontal bones. Sheep and goats also 

 keep within the boundary of this type of the Ante- 

 lope family. Calf and cow, therefore, again corro- 

 borate the most important proposition of our doc- 

 trine of descent : that the individual development 

 is an abridged repetition of the historical develop- 

 ment of the species. 



On the accompanying table of Eiitimeyer's we 

 have the sub-families of the Oxen classed according 

 to the form of their skulls. It b ^ins with the 

 buffaloes, which, as regards skull and the position 

 of their horns, have deviated v ast from the Ante- 

 lopes, and closes with the domestic ox, which has 

 differentiated the most. We gather from this 

 table which contains the quintessence of all the 



