1870.] ANATOMY OF THE PRONGBUCK. 347 
of the trachea, a few irregular-contoured glandular-like depressions 
(g!., g1*) ; but these I am inclined to consider merely of pathological 
import. 

Structure of the larynx of the male Prongbuck. 
A. Side view, with attached hyoid bone. Sk. Stylo-hyal. C.. Cerato-hyal. 
Bh. Basihyal. Th. Thyro-hyal. 8. g!. Origin of the stylo-glossus muscle, 
&e. S.g?. A second. upper portion, which goes to the root and side of 
tongue. Hp. Epiglottis. p. Wrisbergian? projections. 47. Arytenoi- 
deus muscle. 7. Thyroid cartilage. Cr. Cricoid cartilage. ¢r. Trachea; 
and * denotes the lateral ridging of the cartilage rings. w. Portions of the 
- superior laryngeal nerve. 
B. Section of the larynx—half of the thyroid alx and tracheal rings being 
sliced through and partially removed to show the interior structure, vocal 
muscles, arytenoid and other cartilages. 4. Arytenoid cartilage. S. Car- 
tilage of Santorini; and, above this, p, fatty Wrisbergian? projection. 
Th. a, Lower, and Th, a2, Upper thyro-arytenoid muscles. ZL.c a. Lateral 
crico-arytenoideus. g/., g/.* Glandular depressions of pathological origin ? 
The remaining letters apply as in Fig. 4: a portion of the inferior cornu 
remains on the cricoid cartilage. 
C. Laryngeal aperture, looked at from above and behind. ap. Aperture of 
larynx, with the projections from the Wrisbergian? cartilages. 1. p. La- 
ryngeal pouch. 
There is a double thyro-arytenoid muscle, the lower (Th. a') being 
of equivalent volume to the upper (7. a*); and both are strong 
muscular bands. The superior partly overlaps the inferior portion 
posteriorly ; and together they occupy the outer surface of the aryte- 
noid cartilage, except so much as is taken up by the under-mentioned 
muscle. 
This, the lateral crico-arytenoid muscle (L.c. a), has a longish 
narrow belly, arising partly tendinous from the upper edge of the 
