VII.] 



UNGULATA. 



97 



In the Pig (Fig. 36) and Hippopotamus the presternum is 

 ( ompressed and keeled ; the articular facets for the first 

 pair of ribs are close together on its upper surface ; but the 

 mesosternum is broad and flat, the first segment being 

 transitional, compressed in front, and broad posteriorly. 



FIG. 35. Sternum and sternal ribs of 

 Red Deer (Cftvn t elaf-hut), \. fs 



the 



presternum ; mi 



xiphisternum. 



nicso-icrnum 



KH;. 36 Sternum of the Pig (S*i 

 scro/a), \. fit presternum ; tin meso- 

 sternum ; .rt xii>histcmum. 



The xiphisternum is narrow and pointed. The sternum of 

 the Pig very often retains indications of the primordial 

 median fissure through life. 



The Horse and the Tapir have a very peculiar sternum. 



H 



