Tlati: XXIX 



Fig. 9. Ateles hybridus. Brown spider monkey. Columbia University IMorpho- 

 logical Museum, Xo. iq6i. 



I, I. Submaxillary gland and duct opening. 



/". Accessory submaxillary glands. 



J. Lesser sublingual glands. 



5, 5. Parotid gland and duct opening. 



