346 DR. J. MURIE ON THE {May 26, 
it is 0-8 inch broad and about as much in length or fore and aft dia- 
meter; glandular impressions stud its surface. There are well-marked 
fossee or upper laryngeal pouches (/.p) between it and the thyroid 
ale. The superior aperture of the larynx (ap) is narrow, and 0°8 
inch long. Between it and the aforesaid pouches are two broad 
rovghish prominences, together having a V-shaped outline; these 
elevations are due to the large arytenoids and cartilages of Santorini 
or Wrisberg ? with superimposed fatty tissue and membrane. 
As fig. A shows, the thyroid cartilage (7') is of moderate height 
(1°3 inch), breadth 1°5 inch, and obtuse in front, the pomum being 
bulbous but not very prominent. The upper or anterior cornu is 
remarkably short, barely projecting above the very shallow concave 
upper border. The posterior border is more deeply scooped out 
above, but reversely arched below. The inferior cornu is a cartila- 
ginous rod half an inch long. Excepting a narrow deepish notch 
close to the inferior cornu, the lower border of the thyroid is straight. 
The front portion of the cartilage is of much firmer consistence than 
the lateral plates ; the latter are flat and without any marked oblique 
ridge. 
The hinder shield of the cricoid (Cr) is slightly more than 1:2 inch 
in vertical, and exactly that in transverse diameter. The surface is 
broadly convex in the same directions. The upper and lower mar- 
gins are each widely rounded, the former being mesially concave, but 
the latter convex, and without any narrowed elongation. The infe- 
rior cornu is articulated a line above the lower lateral and wide- 
sweeping arciform border. ‘The anterior ring completing the cricoid 
is some ("3 inch broad throughout, and very moderately bent down- 
wards or towards the trachea. The cricoid is altogether composed 
of a thicker substance than is the thyroid cartilage; its antero- 
posterior diameter is 1*7 inch, the front ring projecting as much as 
(but no more than), the boss of the pomum Adami. 
Each arytenoid (fig. 3 B, A) is a solid cartilagmous body of a 
trihedral figure, and 0:7 inch in extreme diameters. Individually 
the faces and borders are slightly concave. Upon the summit the 
cartilage of Santorini (S), or (Wrisberg?) projects. This is com- 
posed of soft yellow elastic ligament, narrow and falciform in figure, 
and reaches in a tapering manner 0°3 inch behind the arytenoid car- 
tilage. Its thickish part is close upon an inch long. 
There is, however, an apparent continuation of the same yellow 
elastic substance as a thin band, downwards and forwards, from the 
anterior apex of the arytenoid to the immer thyroid fossa, and consti- 
tuting the inferior thyro-arytenoid ligament or true vocal cora. These 
cords approximate in front, but leave behind them a wide wedge- 
shaped inferior aperture of the larynx or rima glottidis. The supe- 
rior thyro-arytenoid ligaments, or false vocal cords, are not well pro- 
nounced, but still traceable from the fatty tissue above the corni- 
cula laryngis towards the epiglottis. 
The membrane between the false and true vocal cords is smoothish 
and perfectly free from sinuses or ventricles. I observed, though, 
on the inner mucous surface of the cricoid, and in part on the wall 
bd 
