J 



KILLED IN THE FRITH OF FORTH. 887 



inches and a third, but suddenly diminishes in depth 

 as it extends dorsad. The arytenoid cartilages, as 

 in man, appeared at first view to rest on the atlan-« 

 tal margin of the cricoid ; but, on opening the 

 larynx, were observed to enter more than an inch 

 within the cricoid, and to form the fissure which 

 corresponds to our Rima Glottidis. From the at- 

 lantal margin of the cricoid, they gradually con- 

 verged till they came into contact and inclined 

 dorsad ; their length was seven inches. The epi- 

 glottis was six inches in length, inclining dorsad 

 to the arytenoids : the three meeting with a mem- 

 brane interposed, formed a tube that crossed the 

 pharynx, and pointed to the orifice of the spiracula 

 in the roof of the mouth, through which this spe- 

 cies of animal breathes. At this extremity, the 

 orifice of the tube was somewhat like a fissure from 

 right to left, and thickened at its margin by what 

 appeared to be a glandular substance. 



The trachea was four inches in circumference, and 

 composed of thin cartilages, overlapping one another 

 at several places, and few or none of them preser- 

 ving any uniformity in their breadth. A number 

 of these cartilages near to the cricoid, were imper- 

 fect rings, the deficiency of cartilage being supplied 

 by membrane. Before the trachea advanced halfway 

 to its general division into two branches, it sent off 

 a branch from its right side on the dorsal aspect, in 

 some respects analogous to the azygous bronchial 



b b 2 



