CHART OF TYPOTHERIA 



55 



cially in the genera where the enamel is lacking on all but 

 the front face, but this is entirely a parallelism and there 

 is no evident phylogenetic relationship. As to affinities 

 with the Hyracoidea, Sinclair* has carefully balanced 

 them and finds so little in common between the two groups 



*Princeton Expeditions Reports, Vol. VI, p. 7, 1909. 



