Abstract
It is clear that the Discoglossid skull exhibits features in which it differs from the Liopelmid. The possession of (1) a limb of the septomaxilla in the plica, (2) a recessus olfactorius, (3) a postchoanally united palatal glands, (4) a Bursa angularis oris, (5) a prefacial commissure, (6) a facial canal in the Discoglossidae and their absence in Liopelmidae is sufficient to treat them as irdependent families. The absenee of middle ear, etc., in Liopelmidae (from the view-point of auditory skeleton, de Villiers, however, considers the Liopelmidae as not primitive) andBombina can only be explained as due to parallelism since the absence of those structures also occurs in an unrelated genusHemisus.
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