VIIL] 



HOMOLOGIES. 



197 



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. The duck- 

 billed platypus of Australia (Ornithorhynchus) is the only 



THE PANGOLIN (MANIS). 



mammal which has teeth formed of horn, yet its furry coat 

 is normal and ordinary. Again, the Dugong and Manatee 

 are dermally alike, yet extremely different as regards the 

 structure and number of their teeth. The Porcupine also, 

 in spite of its enormous armature of quills, is furnished 



with as good a supply of teeth as are the hairy members 

 of the same family, but not with a better one ; and in spite 

 of the deficiency of teeth in the hairless dogs, no converse 

 redundancy of teeth has, it is believed, been remarked 

 in Angora cats and rabbits. To say the least, then, this 



