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By: Wellman, C. H. - Richardson, J BType: ArticleIn: PalaeontologyVolume: 36Series:Issue:Date: 1993Page Range: 155--193Publication Info: London, Palaeontological Association, 1957-Subjects:
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By: Edwards, D - Davies, K L - Richardson, J B - Wellman, C. H. - Axe, L.Type: ArticleIn: PalaeontologyVolume: 39Series:Issue:Date: 1996Page Range: 783--800Publication Info: London, Palaeontological Association, 1957-Subjects: