. Bulletin of the British Museum (Natural History), Geology. 300 THE OLD RED SANDSTONE OF BROWN CLEE HILL Wheathillaspis wickhamkingi sp. nov. (PI. 46, fig. 5 ; Text-figs. 53-55) Diagnosis. As for genus. Holotype. An imperfect left anterior ventro-lateral plate with part of spine (P. 28908). Material. Apart from the holotype there is a median ventral plate (), an imperfect left anterior lateral plate () and more doubtfully still, an imperfect right anterior ventro-lateral plate (), and a scute (). Localities. Besom Farm Quarry ; ? Upper Overton Fig. 56.
. Bulletin of the British Museum (Natural History), Geology. 300 THE OLD RED SANDSTONE OF BROWN CLEE HILL Wheathillaspis wickhamkingi sp. nov. (PI. 46, fig. 5 ; Text-figs. 53-55) Diagnosis. As for genus. Holotype. An imperfect left anterior ventro-lateral plate with part of spine (P. 28908). Material. Apart from the holotype there is a median ventral plate (), an imperfect left anterior lateral plate () and more doubtfully still, an imperfect right anterior ventro-lateral plate (), and a scute (). Localities. Besom Farm Quarry ; ? Upper Overton Fig. 56. sp. indet. Fragmentary left posterior dorso-lateral plate. Stottesdon Brook. P-28353-54. X 4-8. UNDETERMINED ARCTOLEPIDS Among the material that cannot be assigned clearly to one of the species described are two interesting plates worthy of some attention. Text-fig. 56 shows an imperfect posterior dorso-lateral plate from the left side, from Stottesdon Brook, the only arthrodire fragment from the locality. It is 1-2 cm. in length, but the depth is uncertain for almost all the plate above the lateral line is damaged. The lower part is intact and shows, in contrast to the same plate of Prescottaspis (Text-fig. 50), a narrow anterior overlap for the anterior lateral plate. This is normal for the group (see Denison, 1958 : 522, text-fig. 109), but in its imperfect state it does not bear any striking resemblance to the forms figured. Allowing for variation in the species and individuals it comes nearest to the plate in Kujdanowiaspis (see Stensio, 1944 : 6o, text-fig. 17a). The tuberculations are of the usual stellate form seen in that genus. The other specimen of particular interest is a stout, very asymmetrical plate, which clearly seems to be a body-scute, from Upper Overton Quarry (, PI. 46, fig. 6). It is an extremely thick plate much wider than deep. The long sides are roughly parallel but the upper is slightly convex and shorter than the lower, which is concave,
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