. Bulletin of the British Museum (Natural History), Geology. 266 R. A. FORTEY & R. M. OWENS base, extending backwards as far as sixth thoracic segment. Posterior border furrow very shallow, hardly apparent. Hypostoma § as wide across anterior wings as long (sag.). Tapers fairly strongly backwards, posterior margin acuminate. Anterior wings broad, anterior margin quite strongly forwardly convex. Lateral border narrow, widest at its mid-length and separated from median body by broad, shallow furrow. Narrows markedly where it meets posterior border, which is short and lip-like. Pair of promin
. Bulletin of the British Museum (Natural History), Geology. 266 R. A. FORTEY & R. M. OWENS base, extending backwards as far as sixth thoracic segment. Posterior border furrow very shallow, hardly apparent. Hypostoma § as wide across anterior wings as long (sag.). Tapers fairly strongly backwards, posterior margin acuminate. Anterior wings broad, anterior margin quite strongly forwardly convex. Lateral border narrow, widest at its mid-length and separated from median body by broad, shallow furrow. Narrows markedly where it meets posterior border, which is short and lip-like. Pair of prominent maculae about f way back on lateral parts of median body, opposite widest part of lateral border. Whole of median body covered with prominent terrace lines; anterior ones weakly convex backwards, but towards posterior become increasingly more so on median body, so as to form deep Us in region of maculae. Sagittally, terrace lines widely spaced as far back as maculae, where they become more crowded, and are similarly crowded laterally. Both lateral and posterior margins with terrace lines, and weak ones also developed in lateral and posterior border Fig. 11. Reconstruction of dorsal exoskeleton of Merlinia rhyakos gen. et sp. nov., x \\ approx. Thorax of 8 segments, which decreases in width (trans.) backwards only slightly. Axis less than pleural width, weakly convex; axial furrows zigzag. Articulating furrow narrow and deep, weakly backwardly convex; articulating half-ring approximately half length (sag.) of annulus, its margin weakly convex forwards. Pleura with deep, oblique pleural furrow of about equal depth all along, beginning close to anterior margin adaxially and diverging from it slowly abaxially, to about half way across pleura (exsag.) where it dies out, about f distance towards end of pleura. Antero- lateral corner of pleura rounded, posterolateral drawn out into a short spine. Inner edge of doublure forms an inward-facing V with its apex at end of pl
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