492 DR. J. MURIE ON SAIGA TARTARICA. [June 9, 
able-sized ploughshare-shaped fatty projections (7. p) meeting in 
front. External to each fatty mass there is a deep furrow which 
tends forwards to the anterior thyroid saculus. . The posterior half 
of the laryngeal aperture is walled by the Santorian cartilages (8) 
and adipose coverings (s.p), the aryteniod cartilages flanking these. 
There are no lateral sinuses or ventricles other than those de- 
scribed. 
The adjoining lips of the rima glottidis forming the true vocal 
cords are continued down from the fatty eminences for the depth of 
an inch, and are set at an oblique angle, parallel with, but above the 
anterior ring of the cricoid. They are smooth-surfaced, and, in the 
relaxed condition of the parts, approximate, leaving but a narrow 
fissure. The aperture behind them, at the arytenoid and Santorini 
cartilages, is a trifle wider; and from these the inferior cavity of the 
laryux descends as a funnel between the vocal cords, the posterior 
ericoid shield, and the expanded hinder arch of the uppermost 
tracheal ring, to the large tracheal passage itself. Thus, as in Hyo- 
moschus*, there is a partially cylindro-tubular passage behind, more 
or less divided by the thrust-forward vocal cords from the anterior or 
upper thyroid chamber. 
Cleared of superincumbent tissues, the thyroid cartilage (7') ex- 
hibits two thin but broad and long lamellar alee, and, besides, a 
median and very remarkable enlarged gibbosity, This salient infla- 
tion inclines towards, but does not reach, the anterior cricoid arch. 
The thyro- and crico-hyoid muscles do not cover it, the inner border 
of the former filling a shallow valley on either side. There is a 
shallow median notch at the anterior border of the cartilage. 
Each anterior cornu is about + inch long, moderately narrow, and 
composed of thin translucent fibro-cartilage. |The posterior cornua 
are much stouter and twice the length of the preceding. The upper 
and lower cornual appendages are situated in a line with each other, 
though widely apart, and directed contrariwise. At their inner 
roots the thyroid border is widely emarginate, the lower deeply so, 
through which passes the cricoid ring and crico-thyroid muscle. The 
entire surface of the thyroid cartilage is smooth and with no defined 
oblique line. In extreme length it is 2} inches, and its greatest dia- 
meter 18 inch. 
The cricoid (C) is much the stronger cartilage. Its posterior 
surface is carinate, the broad upper border being transversly arched 
and free from incision; the lower border is thin and terminates in 
a spatular cartilage. The anterior segment of the cricoid ring de- 
scends obliquely from opposite the postthyroid cornu. At first 
broadish, and then gradually narrowing, it meets its fellow of the 
opposite side in the form of an inverted gothic arch, which, ex- 
panding, overlaps the first and partly the second tracheal rings. The 
postero- “cricoid shield is 2-1 inches long,‘and 14 inch broad, and each 
moiety of the anterior ring is a couple ‘of inches in length. 
Each arytenoid cartilage (4) is about | inch long, and, attached by 
a.joint to the upper and outer angle of the cricoid shield, passes 
* Flower, P. Z.S. 1867, p. 957. 
