In the later Carboniferous rocks the earliest amphibians make their appearance in considerable numbers; they were all Stegocephalians (Labyrinthodonts) with long bodies, a head covered with bony plates and weak or undeveloped limbs. [Please select]
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COMPARISON OF MODERN ORDERS WITH THE LABYRINTHODONTS AND LEPOSPONDYLS [Illustration: Fig. [Please select]
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Many, perhaps the majority of, labyrinthodonts show some features associated with aquatic life even when full-grown, as do the lepospondyls. [Please select]
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Although the stapes and otic region are readily visible in a number of labyrinthodonts and lepospondyls, no indication of an operculum seems to be reported among them. [Please select]
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SUMMARY The Anura probably originated among temnospondylous labyrinthodonts, through a line represented approximately by _Eugyrinus_, _Amphibamus_, and the Triassic frog _Protobatrachus_, as shown by Watson, Piveteau and others. [Please select]
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