The occipital bone of the skull and the auditory capsule are not connected.
2.
The swim bladder has two anterior extensions which extend forward and diverge before terminating above the auditory capsule.
3.
The two anterior extensions extend forward and diverge to end on each side of the basioccipital above the auditory capsule.
4.
Another feature, unique to frogs and salamanders, is the columella-operculum complex adjoining the auditory capsule which is involved in the transmission of both airborne and seismic signals.
5.
The skull, which must have consisted of hardened cartilage, exhibits pairs of nasal and auditory capsules, with a gill-apparatus below its hinder part, but no indications of ordinary jaws.
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