VISCERA OF AN OKAPI. 



195 



The two tributary ducts unite in the Giraffe (the junction was 

 destroyed in the Okapi) close in front of the gland to form a 

 single Wharton's duct (text-fig. 3, Wd.), and there is no reason to 

 think that the separate lobule drained by the anterior tributary 

 is anything but a part of the submaxillaiy gland, for the retro- 

 lingual gland, which at first sight it might be supposed to be, is 

 represented in Ruminants, including the Okapi and Giraffe, by 

 a mass of gland-tissue surrounding the anterior extremity of 

 Wharton's duct close behind the symphysis of the jaw, between 

 the origin of the genioglossus muscle and the sublingual mucous 

 membrane (text-figs. 1, 3, rl.gl.). 



The sublingual gland calls for no comment. The pai'otid gland 

 had been removed with the skin. 



Text-figure 10. 



A Q 



Upper end of stylolij^al of (A) Ohapia and (B) Soemmering's Gazelle. 



The Blood-vessels of the Tongue (text-figs. 11, 12, 13). 



In his description of the anatomy of the Giraffe, Owen* 

 mentions a peculiar plexiform arrangement of the veins close in 

 front of the body of the hyoid bone. In this position there is 

 generally among Ruminants a large venous anastomosis uniting 

 the lingual veins of either side. This anastomosis was strongly 

 developed in the Giraffe's tongue (text-fig. 11, v.a.) dissected for 

 comparison with that of the Okapi, and in front of it, upon the 

 left side (text-fig. 11, v.pl.), there was some slight branching and 

 reunion of the veins, suggesting the plexus mentioned by Owen. 

 There was no indication of a plexus in the Okapi (text-fig. 12). 



Posteriorly, the lingual vein passes through the substance of 

 the submaxillary gland, and where it emerges again to the sur- 

 face receives the facial vein (text-fig. 1,/.-?;.). At this spot lies a 

 very definite lymph-gland, which in the Giraffe lies embedded in 

 the substance of the salivary gland, and by its dark colour forms 

 a very striking object when the surface of the gland is exposed. 



* Owen, Trans. Zool. See. vol. ii. 1841, p. 223. 



