The encyclopædia britannica; a dictionary of arts, sciences, literature and general information . From British. Museum. Catalogue of Fosril Fishes, by permission ol the Trustees. Fig. 3.—Pleraspis rostratd, from the Lower Old Red Sandstone ofHerefordshire, restored by Dr A. S. Woodward; about one-thirdnat. size. members of the group. The Ostracoderms are, indeed, knownonly by the hard armature of the skin, but this sometimes bearsimpressions of certain internal soft parts which have perished. From the Monogr PaUwnl Soc. Fig. 4.—Plerichthys milleri, from the Middle Old Red Sandstoneof Scotland,
The encyclopædia britannica; a dictionary of arts, sciences, literature and general information . From British. Museum. Catalogue of Fosril Fishes, by permission ol the Trustees. Fig. 3.—Pleraspis rostratd, from the Lower Old Red Sandstone ofHerefordshire, restored by Dr A. S. Woodward; about one-thirdnat. size. members of the group. The Ostracoderms are, indeed, knownonly by the hard armature of the skin, but this sometimes bearsimpressions of certain internal soft parts which have perished. From the Monogr PaUwnl Soc. Fig. 4.—Plerichthys milleri, from the Middle Old Red Sandstoneof Scotland, restored by Dr R. H. Traquair; upper (A), lower (B),and left-side view (C), about one-half nat. size. Median occipital. Angular. Anterior dorso-lateral. , Anterior median dorsal. , Anterior ventro-lateral. c. Central. , Dorsal anconeal. Dorsal articular. «./., Extra lateral. External marginal. , Internal marginal. /., Lateral. Lateral occipital. Median. , Marginals of lower limb. , Median ventral. mx., Maxilla. 0., Ocular. Posterior dorso-lateral. , Pre-median. ,Posterior median Posterior , , Terminal.». Ventral Ventral articular. during fossilization. They agree with fishes in the possession ofmedian fins, and resemble the large majority of early fishes in theirunequal-lobed (heterocercal) tail, but they hav
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