78 SINCLAIR— THE SANTA CRUZ TYPOTHERIA. [April 24, 



Various pre-Santa Cruz genera {Archccohyrax, Ar.gyrohyrax) 

 have been referred to the Hyracoidea. Their foot structure is still 

 unknown but the skull and dentition, to judge from the photographs, 

 figures and descriptions examined by the writer, are not hyracoidean 

 in character. Too little is known of these forms to warrant a dis- 

 cussion of their relationship with the Santa Cruz Typotheria, but 

 there can be little doubt that they should be referred to the same 

 suborder. 



Princeton University, April, 1908. 



