VISCERA OF AN OKAPI. 



197 



in the Sheep* and Goat, and occasionally in the Ox. In 

 Antelopes, on the other hand, a common trunk (the arteria 

 maxillaris externa) intervenes between the carotid and the lingual 

 and facial arteries, dividing to form these two arteries about the 

 middle of the submaxillary gland. 



Text-figure 12. 



Blood-vessels at the root of the tongue of Okapia johnstoni. 

 m.m., mylohyoid muscle turned back. 

 Other lettering as in text-fig. 11. 



In passing the hyoid region of the tongue, the main trunk of 

 the lingual artery may lie either deep or superficial to the hyo- 

 glossus muscle. In the Antelopes (text-rig. 13, La.) and Sheep 

 it lies deep to this muscle, and in this position forms in 'the 

 Antelopes a strong anastomosis (text-fig. 13, a.a) with its fellow 

 of the opposite side, from which are given off the continuation of 

 the main lingual artery, the sublingual artery, and branches to 

 the muscles of the hyoid region. 



* In the Sheep dissected it vas given off from an external maxillary trunk as in 

 the Antelopes. 



