HIPPOPOTAMUS. 



21 



Fig. 5.— Lumbar vertebrae. A 3rd, seen from behind ; B 3rd, seen from above ; C 4th (last) seen 

 from below ; D 3rd (abnormal), seen from behind ; E 3rd (abnormal), seen from above. All \ natural 

 size. All from Barrington and preserved in the Sedgwick Museum, Cambridge, a, neural spine: 

 b, neural canal ; c, prezygapophysis, or process bearing it : d, postzygapophysis ; e, transverse process : 

 ./', anterior face of centrum : g, posterior face of centrum ; h, extra articulating surface on tranverse 

 process of abnormal vertebra ; i, articulating surface for 1st sacral. 



