CHAP. IV] THE GENERAL ANATOMY OF GORILLA 



201 



The epiglottis is provided with a distinct hyo-epiglottideus 

 muscle, suggestive of the arrangement found in the carnivora, but 

 not normal in Man. No cuneiform cartilages were detected in the 

 adult male example described, but the cornicula were large, and 

 gave a recurved appearance to the arytenoid cartilages. 



The plica vocalis (" true " vocal cord) when viewed in coronal 

 section, exhibits an attenuated membranous flange at its free 

 margin (Fig. 133). The M. thyro-arytenoideus has a distinctly 



Upper saccule 

 Hyoid bone 

 Infra-hyoid saccule 



Conjoined saccules 



Pectoral saccule 



Axillary saccule 



Fig. 132. Diagram of the laryngeal pouches of an adult male Gorilla 

 (Specimen "Cy," Mus. Anat. Cant.). Communication with the laryngeal cavity 

 is established on each side (laterally but not medially) near the base of the "upper 

 saccule" and just below the level of the hyoid bone. Thus the two lateral out- 

 growths have evidently coalesced as the "conjoined saccule." 



circumscribed outline. In these characters (of the plica vocalis) 

 a contrast with the human larynx is distinct, and though the 

 Gorilla has advanced beyond the stage reached by the Cercopithe- 

 cidae, yet the Chimpanzee and not the Gorilla makes the nearer 

 approach to Man in such details. 



The thyroid body consists of two lateral lobes (about the size 

 of large almonds) joined by a narrow isthmus. No pyramidal lobe 

 was seen in the animal dissected by me. 



