By J. A. Moy-Thomas

I have revised Moy-Thomas's wide-spread e-book on Palaeozoic fishes in an try and contain many of the substantial advances which were made during this box during the last 30 years, that have in a few respects made the 1st version heavily out-of-date. The publication is now unavoidably longer, yet its scope is still an identical and the unique method has been major­ tained so far as attainable. i've got, besides the fact that, undertaken a certain quantity ofre­ association of the contents, consonant with our altering perspectives of fish evolution, and feature attempted to mirror a number of the present preoccupations of scholars of fish evolution in extended sections on mode of lifestyles and relation­ ships. The illustrations were thoroughly changed, and in identifying the figures i've been confronted with an embarrassing richness of resource fabric. In an try to maintain the figures all the way down to an inexpensive quantity, i've got determined that it really is greater to have a couple of species illustrated with transparent drawings than supply thumb-nail sketches of the entire varieties pointed out within the textual content, and so far as attainable to limit the illustrations to Palaeozoic species. all of the illustrations were redrawn to a standard kind, and often times they've been especially ready or converted for this booklet. Authors' names are actually incorporated within the textual content and an inventory of references is given on the finish of every chapter.

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Ventrally there are short haemal ribs which posteriorly become haemal arches with spines, and in the caudal region are articulated with distally bifurcating radials forming a heterocercal tail. The neurocranium is dorsoventrally compressed and complete ventrally with a depression for the hypophysis, but the larger part of the skull-roof appears to have been uncalcified. The auditory capsules are large and the skull ends anteriorly in a number of rostral processes. Beneath the neurocranium lie several paired rods which have been interpreted as part ofthe mechanism of a rasping tongue apparatus, although they may be branchial arches.

M. S. (1954) 'A consideration of ostracoderms'. Phil. Trans. Roy. , (B) 238, 1-25. Westoll, T. S. (1945)' A new cephalaspid fish from the Downtonian of Scotland, with 33 PALAEOZOIC FISHES notes on the structure and classification of Ostracoderms'. Trans. R. Soc. , 61,341-357. Westoll, T. S. (1958) 'The lateral fin-fold theory and the pectoral fins of ostracoderms and early fishes', in Studies on fossil vertebrates, ed. Westoll, T. S. (The Athlone Press, London) p. 180. White, E. I. (1958) 'On Cephalaspis lyelli Agassiz'.

6. Half dorsal discs showing sensory canals and 'growth-stages'. Stage of completion of armour stippled. (After White). A. Poraspis polaris; B. Pteraspis leathensis; C. Pteraspis rostrata; D. Pteraspis crouchi; E. Rhinopteraspis dunensis. the dorsal network of sensory lines became entrapped in the dorsal shield as soon as the armour was formed, and the subsequent growth of the shield took place outside this network (Fig. 6). From this we can see that the armour was acquired not long before full growth in early pteraspids, but that in later forms the period of growth after the formation of the armour became progressively longer (White, 1958).

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