A treatise on zoology . Fig. 313. Dapedias poUtus, Leach ; Lower Jurassic, Dorsetshire. (After A. S. Woodward,Vert. Palaeontology.) Family Semionotidae. The trunk becomes deepened, especially inBapedius, where it is much compressed, and there is a correspondingextension of the dorsal and anal fins. The mouth is small, and the teethdifferentiated into an outer pointed series on the jaws, and inner grindingteeth, often very massive and rounded, on the splenial pterygoids and. J? Fig. 314. Dapedhis poliias, Leacli; restored, with scales removed. (After A. S. Woodward,Vert. Palaeontology.) vomers.

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A treatise on zoology . Fig. 313. Dapedias poUtus, Leach ; Lower Jurassic, Dorsetshire. (After A. S. Woodward,Vert. Palaeontology.) Family Semionotidae. The trunk becomes deepened, especially inBapedius, where it is much compressed, and there is a correspondingextension of the dorsal and anal fins. The mouth is small, and the teethdifferentiated into an outer pointed series on the jaws, and inner grindingteeth, often very massive and rounded, on the splenial pterygoids and. J? Fig. 314. Dapedhis poliias, Leacli; restored, with scales removed. (After A. S. Woodward,Vert. Palaeontology.) vomers. The latter may fuse to a single bone (Lepidotus). In the morespecialised forms the grinding teeth form a pavement. The head iscompletely covered by plates with ganoid ornament (Figs. 315, 316). A AMIOIDEI 335 ring of Hiaiiy circuniorbitals, several suprateinporals, and a number ofemail cheek-plates occur, but the median gular may be absent {Lcpidotus).

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Keywords: ., bookcentury1900, bookdecade1900, bookpublishe, booksubjectzoology