The prefrontals are in lateral contact with the nasals.
The prefrontals are in contact with the nasals.
Prefrontals not in contact with the basals.
Viperidae.-The maxillaries are very short, movably pivoting upon the prefrontals and also attached to the ectopterygoids, so that they can be erected together with the large poison fangs, which, besides reserve teeth, are the only maxillary teeth.
The prefrontals are not in contact with the nasals.