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Onchus tenuistriatus, Agassiz. Bone-bed. Upper Silurian. Shagreen-scales of a placoid fish, Thelodus parvidens, Agassiz. Plectrodus mirabilis, Agassiz.
These fish belong to the genera Acrodus, Hybodus, Gyrolepis, and Saurichthys. Hybodus plicatilis, Agassiz. Teeth. Saurichthys apicalis, Agassiz. Tooth; natural size and magnified. Gyrolepis tenuistriatus, Agassiz. Scale; natural size and magnified. Remains of saurians, Plesiosaurus among others, have also been found in the bone-bed, and plates of an Encrinus.
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