THE EXTERNAL FORM OF ANTHROPOID APES. 51 



Tlie grey gibbon (Rylohates leuciscus, Kuhl) is 

 covered with a thick, long, and woolly coat, with 

 scattered hairs which are curly, and have two or 



three rings of dark colour on a light ground. The 

 upper part of the head is black ; light, or sometimes 

 white, hair encircles the blackish face. The general 



