Vlll SYSTEMATIC INDEX. 



19. Kanguroo tribe. Have six front teeth above, and two be- 

 low. The fore legs are much shorter than the others; 

 and most of the females have a pouch upon the belly for 

 their young page 60 



Great Kanguroo #>, 



30. Mole tribe. Have six front teeth above, and eight below. 



The fore legs are much stronger than the others 61 



Common Mole ib. 



21. Shrew tribe. Have two front teeth above, and four below . 63 

 Common Shrew 63 | Pigmy Shrew ib. 



22. Urchin tribe Have two front teeth in each jaw. The 

 body is beset with bristles 64 



Hedge-hog , ib. 



ORDER IV. GLIRES. 



These have no canine teeth, or tusks, in either jaw. They have 

 two long front teeth in each jaw, standing close together, but 

 at a distance from the grinders. 



23. Porcupine tribe. Have the body covered with long spines 65 

 Common Porcupine ib. 



24. Cavy tribe. Have the front teeth wedge-shaped, and four 

 grinders on each side. No collar-bones 66 



Guinea Pig ib. 



25. Beaver tribe. Have the upper front teeth wedge-shaped; 

 and four grinders on each side. The tail is flat and scaly. 

 They have collar-bones * < 67 



Common Beaver 67 | Chilese Beaver 69 



26. Rat tribe. Have the upper front teeth wedge-shaped ; 



and three or two grinders on each side. They have col- 

 lar-bones 69 



Musk Rat 69 I Field Mouse 71 



House Rat 70 | -Lemming 72 



Water Rat ib. 



Common Mouse 71 



Hamster 



27- Marmot tribe. Have two wedge-shaped front teeth in 

 each jaw ; and five grinders on each side above, and four 

 below. They have collar-bones 74 



Alpine Marmot , ib. 



