. Bulletin of the British Museum (Natural History), Geology. . Fig. 100 Colpocoryphe taylorum sp. nov. Upper Arenig, Fennian Stage, B. rushtoni Biozone, Ponty- fenni Formation, loc. 23, Pontyfenni. a, cranidium showing fine granulose sculpture and small palpebral lobe, x 4, ; b, small thorax, x 10, NMW ; c, holotype, almost complete axial shield, x 2, NMW ; d, f, small pygidium, latex cast from external mould showing granulose sculpture, and internal mould, x 10, NMW , b; e, large pygidium, x 3, NMW ; g, small cranidium, x 5, It. 18995; h, thorax and
. Bulletin of the British Museum (Natural History), Geology. . Fig. 100 Colpocoryphe taylorum sp. nov. Upper Arenig, Fennian Stage, B. rushtoni Biozone, Ponty- fenni Formation, loc. 23, Pontyfenni. a, cranidium showing fine granulose sculpture and small palpebral lobe, x 4, ; b, small thorax, x 10, NMW ; c, holotype, almost complete axial shield, x 2, NMW ; d, f, small pygidium, latex cast from external mould showing granulose sculpture, and internal mould, x 10, NMW , b; e, large pygidium, x 3, NMW ; g, small cranidium, x 5, It. 18995; h, thorax and pygidium, showing rounded lateral extremities of thoracic pleurae, x 3, It. 18996. Thorax of thirteen segments, which give a typically concave lateral profile which may be consistent with a burrowing mode of life for this species of the kind suggested by Hammann (1983: 29, text-fig. 11). Pleurae with narrow anterior and broad posterior bands, and flexed steeply downwards at fulcrum. Pygidium with distinct border furrow typical for Colpocoryphe, which tends to be less pro- nounced on smaller specimens than on larger ones. Pleural area with one pleural and one interpleural furrow, but otherwise smooth. Axis broad, with 11-12 rings which become progres- sively narrower (sag.) and less well defined towards posterior. It tapers backwards only slightly as far as a position opposite border furrow, after which it tapers rapidly to a blunt end which merges insensibly with posterior border before reaching posterior margin. Sculpture on cranidium and pygidium of numerous, very fine granules. Remarks. The most distinctive feature of this species is the small palpebral lobe, situated distant from the axial furrow. This, together with the subquadrate glabella, immediately dis- tinguishes it from the other Arenig species C. thorali Dean and C. maynardensis Courtessole, Pillet & Vizciano, both from the Montagne Noire. Both have a much larger eye which is situated close to the axial furrow,
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