PROSOTHERIUM GARZONI 67 



the other hand, have a marked inflexion on the inner side, 

 giving them the appearance of permanent molars. The 

 series measures 31 mm. of which the deciduous premolars 

 occupy just half. 



The mandible is deep, especially the posterior portion; 

 has a very slender coronoid process; and a slightly rounded 

 articular condyle, which is a little longer than wide, so 



Fig. 32. Left mandible natural size. 



that it would seem to allow a forward and backward mo- 

 tion of the lower jaw. 



The vertebrae are considerably crushed, but have in 

 each case the characteristics of the corresponding verte- 

 bra of Pachyrukhos. 



Of the humerus, the head and distal ends are preserved, 

 indicating a rather long and slender bone, very like that of 

 Pachyrukhos. About three-fourths of the ulna is present, 

 and it is also long and slender, with a wide articular facet 

 for the radius, which is entirely separate from that for the 

 humerus. Two metacarpals show the same elongation 

 of the limb, and the two phalanges preserved indicate a 

 small front foot. 



