HIPPOPOTAMUS. 



31 



The tibia is a very stout bone with the proximal end much expanded. The 

 shaft is triangular in cross-section, and the cnemial crest very strong. The distal 

 end is broad and somewhat compressed antero-posteriorlv. 



The fibula is a slender but distinct bone with a small proximal end and widely 

 expanded distal end. 



Fig. 16.— Front view of left pes of skeleton made up of bones from Barrington, mounted in Sedgwick 

 Museum, Cambridge, i natural size, a, ealeaneum ; b, astragalus ; r, cuboid : d, navicular ; e, 2nd 

 metatarsal ; /, 4th metatarsal ; g, proximal phalanx of 3rd digit ; h, space which should be occupied by 

 the missing cuneiforms. 



All the bones of the tarsus are separate. The large astragalus presents no 

 special features, and the ealeaneum is relatively shorter and stouter than in most 

 artiodactyls. The cuboid and navicular are large bones. The internal cuneiform 

 is missing and the middle is very small. A small pisiform is present 



There is less uniformity in the length of the metatarsals than in that of the 

 metacarpals, those of the 3rd and 4th digits being much longer than those of the 

 2nd and 5th. The ungual phalanges in each case are broad and flattened and a 

 pair of sesamoid bones occur at each metatarso-phalangeal articulation. 



