. Guide leaflet. ^ the latest restoration, made by Heintz of Oslo, A metal model showing roughly the arrange-ment of the armor plates of the head and thorax in this new restora-tion is to be seen in the case with the mounted head. This modelillustrates the unique jaw mechanism of these fishes who opened theirjaws by throwing the head back and drawing down the lower jaw. Fourpair of muscles, worked respectively to lift the head roof, to move thehead roof downward, to move the lower jaw upward, and to move thelower jaw downward. That is, the first and fourth pair operated to openthe mo
. Guide leaflet. ^ the latest restoration, made by Heintz of Oslo, A metal model showing roughly the arrange-ment of the armor plates of the head and thorax in this new restora-tion is to be seen in the case with the mounted head. This modelillustrates the unique jaw mechanism of these fishes who opened theirjaws by throwing the head back and drawing down the lower jaw. Fourpair of muscles, worked respectively to lift the head roof, to move thehead roof downward, to move the lower jaw upward, and to move thelower jaw downward. That is, the first and fourth pair operated to openthe mouth and the second and third pair to shut it. This unusual mouthmechanism has never before been observed in any fossil or living
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectnatural, bookyear1901
