VIII.] 



HOMOLOGIES. 



189 



tainly true, but it should be borne in mind at the same time 

 that the armadillos, which are much more abnormal than 

 are the American ant-eaters as regards their dermal cover- 

 ing, in their dentition are less so. The Cape ant-eater, on 

 the other hand, the Aard-vark (Orycteropus), has teeth 

 formed on a type quite different from that existing in any 

 other mammal ; yet its hairy coat is not known to exhibit 



THE PANGOLIN (MAN is). 



any such strange peculiarity. Again, those remarkable 

 scaly ant-eaters of the Old World the pangolins (Manis) 

 stand alone among mammals as regards their dermal cov- 

 ering ; having been classed with lizards by early naturalists 

 on account of their clothing of scales, yet their mouth is 



like that of the hairy ant-eaters of the New World. On 

 the other hand, the duck-billed platypus of Australia (Orni- 

 thorhynchus) is the only mammal which has teeth formed of 



