VISCERA OF AN OKAPI. 



191 



genera, and can only with difficulty be separated into its two 

 component halves. 



The condition is shown in text-figs. 1 and 3. It will be noticed 

 that the belly of the geniohyoid extends only abovit halfway 

 from the hyoid to the symphysis menti, and is continued upon 

 the ventral surface of the genioglossus as a flat tendon from 

 which a large part of the latter muscle arises. 



Text-figure 4. 



IX ^ 



Dissection of the pliarjnix of Olcapia johnstoni. 



cr.c, cricoid cartilage ; cr.ph.m., crico-pharyngeal muscle ; li.l.m., hyoideus latus 

 muscle; /i^/.a., hj'oidean branch of lingual artery; /jy.jj/i.m., hyopharyngeal 

 muscle; ?._9^., cervical lymph-gland ; s.Z.a., superior laryngeal artery; st.g.m?, 

 lesser stjdoglossus muscle; st.ph.m., slips of stj'lo-pharjaigeal muscle;. 

 th.c, thyroid cartilage ; th.h., thyroid body ; th.hy.m., thyro-hyoid muscle 

 th.ph.m., thyro-pharyngeal muscle. 



X^. Pharyngeal branches of vagus. X-. Superior laryngeal branch of vagus. 



Other lettering as in text-fig. 1. 



Stylohyoid Muscle. 



The round tendon of origin of this muscle differs a good deal 

 in length in different genera of Ruminants. It is relatively short 

 in Antelopes, considerably longer in the Okapi and Sheep, and 

 longer again, though not by much, in the Giraffe. 



