Phaneroglossa, - Eustachian tubes separated; tongue present.
The basi-pterygoids (bpg) are mere knobs, and the common eustachian opening is seen between them.
Here may be mentioned the guttural pouches, large airsacs from the Eustachian tubes, and lying behind the upper part of the pharynx, the function of which is also not understood.
They contribute to the formation of the auditory meatus, and of the right and left carotid canals which accompany the eustachian tubes.
Eo, Opisthotic. prp, Pterygoid process of sphe eu, Eustachian tube.
Aglossa, - Eustachian tubes united into a single ostium pharyngeum; no tongue.