79 6 



COMPENDIUM OF GENERIC DISTINCTIONS. 



Genus. Ory ct6 ropus. 



o o o o 7 7 5 5 



Teeth. I. > C. M. , or when 



oo oo 6 6 5 5 

 aged. Their form is cylindrical and their crowns 

 flat. 



Limbs. Fore-feet with four toes, hind with five. 

 Claws very powerful adapted for digging. 

 Tail moderate and covered with hair. 



Genus. Myrmec6phaga. 



Fore-feet with four toes, hind with five. 

 Habitat. South America. 



Genus Tamandua. 



Distinguished from Myrmec6phaga by the shorter 

 head and plumeless tail. 



Genus. Cyclothurus. 



Fore-feet with two toes, hind with four. Nose 

 not so long as in preceding genus. Ribs very broad 

 and fiat, overlapping each other. 



Habitat. South America. 



Sub-family. Ornithorhyncina. 



Teeth horny, or none. Hind-feet in males with 

 hollow spur. Feet with five toes, and short. Snout 

 long, ana covered with naked skin. 



Genus. Pldtypus. 

 2 2 



Teeth flat and horny, without fangs. Snout 

 2 a 



flattened like duck's bill. Lower jaw shorter and 

 narrower. Body covered with soft hair. Tail 

 broad and flattened. 

 Habitat. Australia. 



Genus. Echidna. 



Teeth none. Snout long, slender, and rather 

 pointed ; and very little mouth. Tongue long and 

 extensile. Feet with large, curved claws. Tail 

 short. Body covered with spines, mixed with hairs. 



Habitat. Australia. 



Family. BRADYPIDJE. 



Head flat and short. Legs long, and furnished 

 with large, curved, compressed claws. 



Genus. Cholcepus. 



First molar tooth long, and like a canine. Fore- 

 feet with two toes. Tail none. 

 Habitat. West Indies. 



Genus. Brddypus. 



Teeth of adult. M. , separate and cylindii- 



44 



cal. Ears very short. Fore-feet with two or three 

 toes, hind with three, joined as far as the claws. 

 Tail none, or very short. 

 Habitat. South America. 



