MORROW — NOTES ON THE CARIBOO. 287 



"At the notch formed in the upper border of the thyroid carti- 

 lage, by the junction of its Ala*, is found a pit or depression 

 forward of the mucous membrane which lines it. Viewed in posi- 

 tion, it would be taken for an opening leading into the thyro-hyoid 

 space, and seems large enough to admit an ordinary lead pencil ; a 

 probe introduced here found a very shallow depression scarcely 

 one-fourth of an inch in depth ; this appearance was obliterated 

 when the walls of the organ were stretched apart after section, but 

 returned when the parts were allowed to resume their usual rela- 

 tions to each other. It is therefore a slight hernia or depression 

 forward of the respiratory mucous membrane into the thyro-hyoid 

 space ; the thyro-hyoid membrane which forms here, the outer wall 

 of the respiratory passage, is thin and lax ; when the point of the 

 little finger is forced into the depression it produces a sacculus, the 

 walls of which will consist of mucous membrane internally, and the 

 thyro-hyoid membrane externally, it finds here also, opposite the 

 depression and partly filling the space, a flattened rounded oblong 

 body about the size of a small horse bean ; dissecting the areolar 

 tissue, covering it in front, this body is seen external to and resting 

 upon the thyro-hyoid membrane, its upper border connected with 

 the base of the epiglottis is provided with a thin fibrous coat, and 

 when cut into, presents to the eye a coarse granular structure. 



'• Arising apparently from the base of the epiglottis on either 

 side 'possibly continuous with the thyro-epiglottidean and aryteno- 

 epiglottidean muscles,' are two bands of muscular fibres, they pass 

 over this body on either side, being connected with it by fibrous 

 adhesions; extending forwards, they unite at its upper border, 

 forming a single muscular band, which becomes inserted into the 

 upper and inner edge of the hyoid bone ; these fibres have no 

 analogues in man. 



" A microscopic examination of the structure forming this body, 

 shows it to consist mostly of fatty tissue, with a moderate propor- 

 tion of granular cells, apparently epithelial. 



" The examination of the organ in an adult female, and female 

 fawn, presents essentially the same anatomical peculiarities as 

 given above ; but the pit at the laryngeal notch is deeper in the 



