. Bulletin of the British Museum (Natural History), Geology. PRODUCTELLID AND PLICATIFERID BRACHIOPODS 113. Figs 54-60 Admodontgosus cracoensis sp. nov. Figs 54a-d, holotype in ventral, anterior, lateral and posterior views. Note the shallow body cavity (arrowed), total rugation and median deflection of the ornamentation. Butter Haw Hill. BD2447. X2. Figs 55a, b, ventral and ventrolateral views. Bolland, Lancashire. Gilbertson Collection, B439. X2. Fig. 56, a specimen with its anterior ventral valve missing but showing some of the posterior spine bases. Wetton, Staffordshire. Davidson Collecti
. Bulletin of the British Museum (Natural History), Geology. PRODUCTELLID AND PLICATIFERID BRACHIOPODS 113. Figs 54-60 Admodontgosus cracoensis sp. nov. Figs 54a-d, holotype in ventral, anterior, lateral and posterior views. Note the shallow body cavity (arrowed), total rugation and median deflection of the ornamentation. Butter Haw Hill. BD2447. X2. Figs 55a, b, ventral and ventrolateral views. Bolland, Lancashire. Gilbertson Collection, B439. X2. Fig. 56, a specimen with its anterior ventral valve missing but showing some of the posterior spine bases. Wetton, Staffordshire. Davidson Collection, B5784/1. X2. Figs 57a, b, ventral and anterolateral views of a specimen showing some delicate flanking spine bases. Wirksworth, Derbyshire. BD6577. X2. Fig. 58, an incomplete specimen viewed laterally. ?Wetton, Staffordshire. Bateman collection (astutely labelled as 'undescribed'), Sheffield City Museum, [not numbered]. Xl-5. Figs 59a-c, anterior, anterolateral and ventral views of an almost complete specimen showing, despite a little shell damage, the characteristic deflection of rugae anteriorly. Wetton, Staffordshire. Davidson Collection, B5784/2. X2. Fig. 60, an anterior view showing median spine bases. Wetton, Staffordshire. Davidson Collection, B5784/4. X2. are indications of a low ridge medially ( B13811), separat- ing the muscle fields. The dorsal valve has a low, sessile, strongly bilobed cardinal process (BD3350), as seen from the internal surface. There is a small alveolus and weak lateral ridges diverge slightly from the hinge line ( BD2454, BD2456). There is no evidence of ear baffles. Discussion. Although rather a rare species, it is distinctive and sufficient specimens have been accumulated to observe that in some the flanks are more widely spreading than in the other slightly narrower forms. Nearly half the specimens are somewhat exfoliated dorsal valves and, unless part of the ventral valve is also preserved, it is not always easy to recognize when
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