. Bulletin of the British Museum (Natural History), Geology. 162 R. A. FORTEY & R. M. OWENS. Fig. 41 Gastropolus obtusicaudatus (Hicks 1875). a, cast of poorly preserved axial shield, original of Postlethwaite 1885: pi. 3, fig. 16 (as drawn by Goodchild). Outerside, Lake District, x 1, SM A45444; b, holotype, thorax and pygidium in poor preservation, original of Hicks 1875: pi. 10, fig. 3, Llanvirn quarry, early Llanvirn, presumed to be D. artus Biozone, x 1, SM A45154. Holotype. Thorax and pygidium, SM A45154, from the early Llanvirn of Llanvirn quarry. Material. Pygidia: It. 19615-6; cra
. Bulletin of the British Museum (Natural History), Geology. 162 R. A. FORTEY & R. M. OWENS. Fig. 41 Gastropolus obtusicaudatus (Hicks 1875). a, cast of poorly preserved axial shield, original of Postlethwaite 1885: pi. 3, fig. 16 (as drawn by Goodchild). Outerside, Lake District, x 1, SM A45444; b, holotype, thorax and pygidium in poor preservation, original of Hicks 1875: pi. 10, fig. 3, Llanvirn quarry, early Llanvirn, presumed to be D. artus Biozone, x 1, SM A45154. Holotype. Thorax and pygidium, SM A45154, from the early Llanvirn of Llanvirn quarry. Material. Pygidia: It. 19615-6; cranidia: It. 19613-4. Diagnosis. See that of genus. Stratigraphical range. The species occurs in the Llanfallteg Formation, early Llanvirn part, in south Wales at Cefn-maen-llwyd farmyard. Hope Shales, Shropshire, early Llanvirn; Skiddaw Slates at Outerside, probably also from the earliest Llanvirn. Description. Entire exoskeleton slightly less than twice as long as wide, the cephalon account- ing for half the total length. Cranidium wider than long, maximum width at posterior margin between 0-7 and 0-9 of sagittal length. The glabella has a nearly circular outline; the axial furrows converge inwards and backwards quite sharply, but fade out before reaching the posterior cranidial margin. The fixed cheeks so defined have a maximum width about three- quarters length (exsag.) and are slightly inflated. The sutural margins of the remnant fixed cheeks are gently convex-outwards. Palpebral rims are apparently lacking. Otherwise, the cranidium is almost featureless; there are faint indications of a few terrace lines on the frontal glabellar lobe. We presume that large eyes lay along the cephalic margin as in other cyclo- pygids. Thorax with six segments. Apart from being relatively wide (tr.) it is of usual cyclopygid construction, with the axis hardly tapering over the first three segments, thereafter tapering. Please note that these images are extracted from scanned page images that
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