54 " THE SKELETON OF THE FROG. 
FP 
Fig. 10. A transverse section across the posterior part of the frog’s head, 
to show the position and relations of the auditory organs, Eustachian tubes, 
and hyoid apparatus. On the right side the section passes through the tym- 
panic cavity and the columella; on the left side through the anterior cornu 
of the hyoid. The cartilage is dotted, and the bones represented black. 
' A, parasphenoid: AS, angulosplenial: B, buccal cavity; C, columella: D, 
tympanic membrane: E, Hustachian tube: F, anterior cornu of the hyoid: 
FP, frontoparietal: G, glottis: H, arytenoid cartilage: 1, posterior cornu of 
hyoid: K, auditory nerve: L, vestibule: M, anterior vertical semicircular 
canal: N, horizontal semicircular canal: O, pro-otic: P, pterygoid: Q, quad- 
rate cartilage: R, quadratojugal: S, squamosal: T, tympanic cartilage: Vv, 
vocal cord: X, mid-brain. 
ii, The anterior cornu of the hyoid: a long slender 
curved rod of cartilage: attached above to the 
auditory capsule just below the fenestra ovalis, 
and curving at first backwards and then forwards 
and downwards to be attached to the anterior 
outer angle of the body of the hyoid. 
b. The body of the hyoid: a flat squarish plate of cartilage 
formed by the fused ventral ends of the hyoid and 
branchial arches, and lying in the floor of the mouth: 
short processes are given off from its angles. 
c. The posterior cornua of the hyoid: a pair of stout bony 
processes diverging from the hinder border of the body 
of the hyoid. 
B. The Appendicular Skeleton. 
Consists of the limbs and the limb-girdles. As in the case of 
