360 



BACKBONED ANIMALS, 



that, in this genus, are augmented by a large sac in the 

 throat that communicates with the larynx, which when 



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:o ! 



M ~ S 



5 2- 

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e 

 1 



filled with air is distended like a huge goitre in the neck. 

 The Hylobates agilis is remarkable for its leaps, clearing 



