376 ORDERS OF MAMMALIA. 



There is no third trochanter to the femur, but the struc- 

 ture of the manus and pes is quite unknown. 



The genera of this order are Toxodon and Ncsodon, botli 

 from late Tertiary or Post-Tertiary deposits in South America. 

 Toxodon was about equal to the Hippopotamus in size ; and 

 both genera present a combination of characters so extra- 

 ordinary, that we must await the discovery of more perfect 

 remains before pronouncing any decided opinion as to their 

 true systematic position. 



