. Bulletin of the British Museum (Natural History), Geology. PRODUCTELLID AND PLICATIFERID BRACHIOPODS 107. Figs 22-23 Productina pectinoides (Phillips), from the Gilbertson Collection, figured by Phillips (1836), Bolland, Lancashire. Figs 22a-c, the lectotype (here selected), viewed laterally, ventrally and posteriorly. B8947. XI. Figs 23a-c, the second small specimen (paralectotype) in the Gilbertson Collection, viewed ventrally, laterally and posteriorly. BB65110. XI. Figs 24-28 Productina cf. pectinoides (Phillips). Figs 24a, b, a small specimen in lateral and ventral views. Skelterton Hil
. Bulletin of the British Museum (Natural History), Geology. PRODUCTELLID AND PLICATIFERID BRACHIOPODS 107. Figs 22-23 Productina pectinoides (Phillips), from the Gilbertson Collection, figured by Phillips (1836), Bolland, Lancashire. Figs 22a-c, the lectotype (here selected), viewed laterally, ventrally and posteriorly. B8947. XI. Figs 23a-c, the second small specimen (paralectotype) in the Gilbertson Collection, viewed ventrally, laterally and posteriorly. BB65110. XI. Figs 24-28 Productina cf. pectinoides (Phillips). Figs 24a, b, a small specimen in lateral and ventral views. Skelterton Hill. BD1674. X2. Figs 25a, b, oblique anterolateral and ventral views of an incomplete specimen, showing the shallow body cavity (arrowed). Butter Haw Hill. BD1667. X2. Fig. 26, a ventral view, showing one spine (arrowed). Butter Haw Hill. BD1668. Xl-5. Figs 27a, b, ventral and lateral views of a specimen with one pair of flank spines (arrowed) near the ears. Butter Haw Hill. BD1666. X2. Figs 28a, b, lateral and ventral views of a large specimen from the Kendal area, Cumbria, closely resembling the type specimen. Sedgwick Museum, Cambridge, E9710. XI. Family PLICATIFERIDAE Muir-Wood & Cooper, 1960 Diagnosis emended. Small to medium productoids in which the ventral visceral disc is only gently convex, giving a shallow to moderate body cavity. Concentric ornament is strong, the ribbing weak to lacking. Spines commonly con- fined to ventral valves. Internal dorsal marginal structures are usual. Subfamily PLICATIFERINAE Muir-Wood & Cooper, 1960 Diagnosis emended. Plicatiferids with moderately deep body cavities, strongly rugose or lamellose visceral discs and dorsal ear baffles. Discussion. These familial diagnoses differ from those given in 1960 or the Treatise (1965) as they are new working diagnoses for the revision of the brachiopod Treatise now in progress. Muir-Wood & Cooper's (1960) subfamily included only Plicatifera. The newly evolving classification elevates the
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