208 ox THE VISCERA OF AN OKAPI. 



The Spleen. 



The spleen (text-fig. 19, s})l.) is massive and wedge-sliaped, and 

 is situated, as in other Ruminants, upon the left anterior surface of 

 the paunch, adherent by its thick end to the diajohragm and with 

 its narrow edge projecting freely to the left into the abdominal 

 cavity. 



The Colic Coil. 



The colic coil is fiat, not conical as in the Giraffe, and is almost 

 circular, measuring 190 mm. in diameter. The gut of which it 

 is constituted is relatively narrow (20 min. in diameter), and is 

 arranged in 3| concentric and 3| excentric coils. This number 

 appears to be high. In Antelopes of which I have seen records * 

 it apparently varies from 1 to 3, in the Ox it is 1|, in Antilo- 

 capra 3 t, and in the Giraffe may be as many as 4 J. 



In judging of the bearing of the above anatomical facts, it must 

 be borne in mind that they gre records of one individual only, 

 but assuming that they fairly represent the condition normal for 

 the species, the following points seem to be most worthy of 

 note : — 



A. In comparison with the Giraffe : 



1 . The form and superficial anatomy of the tongue. 



2. The condition of the geniohyoid and genioglossus 



muscles. 



3. The occipito-styloideus muscle and the form of the 



styloid bone. 



4. The structure and form of the larynx. 



5. The ai"rangement of the lingual arteries. 



6. The general form of the stomach, and particularly the 



character of the reticulum. 



B. As more or less characteristic of the Okapi : 



1. The papillpe of the sublingual fringe. 



2. The cartilaginous os cordis. 



3. The elongation of the upj^er angle of the left lower lobe 



of the lungs. 



4. The specialised papillae in the oesophageal groove of the 



stomach. 



* Beddard, Proc. Zoo]. Soc. 1909, i. p. 181 ; Mitchell, Trans. Zool. Soc. xvii. 1905, 

 p. 473. 



t Beddard, I. c. 



i Owen, Trans. Zool. Soc. vol. ii. 1841, p. 227. 



