40 



ON THE ANATOMY OF THE 



equal, but minute bodies, arranged from side to side. 

 The amygdala and epiglottis are not peculiar. 



The os hyoides differs from that of man, in being 

 anteriorly more prominent and dilated, and by con- 

 taining in its body a cavity capable of holding a 

 large pea ; a structure still more remarkable in the 

 baboon. On laying open the posterior part of the 

 larynx, the two apertures at the base of the epi- 

 glottis, and leading to the double sac or laryngeal 

 pouches discovered by Camper, are visible. These 

 apertures occupy the situation of the ventricles of 

 the human larynx, between the superior and infe- 

 rior ligaments of the glottis ; are 0.4 inch in length, 

 and are placed a little obliquely ; their posterior 

 angles being depressed below the level of the ante- 

 rior, which approximate each other within less than 

 0.2 inch, and are distant from the free extremity of 

 the epiglottis 0.8 inch. The above-mentioned li- 

 gaments of the glottis form the boundaries of these 

 apertures, and are provided with evident longitu- 

 dinal muscular fibres, by which the apertures can 

 be contracted at the will of the animal. The aper- 

 tures lead to two ventricles, considerably larger than 

 in man, extending upward and forward to the ca- 

 vity of the os hyoides, and terminating in two short 

 membranous tubes, which run between the latter 

 bone and the top of the thyroid cartilage, form- 

 ing communications from the larynx to the two 

 pouches or double sac, so well described by Camper. 

 In our subject the left sac appeared to be the lar- 



