. Bulletin of the British Museum (Natural History). 116 L. R. M. COCKS & M. G. LOCKLEY Davidson (1869) shows clearly that it is congeneric with material from Cornwall described as Corineorthis decipiens by Stubblefield (1939), itself recently recognized by M. G. Bassett as a junior synonym of Orthis berthoisi var. cornubiensis Davidson, 1881. Davidson (1881a : 355-7) also discussed the problem of Orthis berthoisi itself, which comes from the slates of La Couyere, Normandy (Rouault 1849 : 68; pi. 2, figs 4^c). Topotype material of berthoisi ( B 13233 in the Davidson Collection ex Tromel
. Bulletin of the British Museum (Natural History). 116 L. R. M. COCKS & M. G. LOCKLEY Davidson (1869) shows clearly that it is congeneric with material from Cornwall described as Corineorthis decipiens by Stubblefield (1939), itself recently recognized by M. G. Bassett as a junior synonym of Orthis berthoisi var. cornubiensis Davidson, 1881. Davidson (1881a : 355-7) also discussed the problem of Orthis berthoisi itself, which comes from the slates of La Couyere, Normandy (Rouault 1849 : 68; pi. 2, figs 4^c). Topotype material of berthoisi ( B 13233 in the Davidson Collection ex Tromelin), although severely crushed, leads us to agree with Davidson that erratica and berthoisi are not the same: until Rouault's types are revised, perhaps berthoisi is best regarded as a nomen dubium. The La Couyere slates are now known to form part of the Riadan Formation, which is late Ordovician in age (Babin et al. 1976a : 374).. â W^M ^^Bt^ â rm/^t ^^Hkk â ^fl| m. j-^mM. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original British Museum (Natural History). London : BM(NH)
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