. Bulletin of the British Museum (Natural History), Geology. 143. 141 142 Figs 141-143 Lagenochitina sp. A; Pontyfenni Formation; x 480 (Fig. 143 x 1200). Fig. 141, MPK 4976, sample MPA 20091; slide 2, T31/2. Fig. 142, MPK 4975, sample MPA 20092; slide 1, P40/3. Fig. 143, detail of aperture x 1200, MPK 4974, sample MPA 20091; slide 2, G32/3. Jenkins 1967 and Lagenochitina sp. of Achab (1982) are both larger than the present form, and both have relatively shorter necks. Achab's Lagenochitina sp. also has a more or less quad- rangular chamber. Acknowledgements The author is grateful to Dr R. A.
. Bulletin of the British Museum (Natural History), Geology. 143. 141 142 Figs 141-143 Lagenochitina sp. A; Pontyfenni Formation; x 480 (Fig. 143 x 1200). Fig. 141, MPK 4976, sample MPA 20091; slide 2, T31/2. Fig. 142, MPK 4975, sample MPA 20092; slide 1, P40/3. Fig. 143, detail of aperture x 1200, MPK 4974, sample MPA 20091; slide 2, G32/3. Jenkins 1967 and Lagenochitina sp. of Achab (1982) are both larger than the present form, and both have relatively shorter necks. Achab's Lagenochitina sp. also has a more or less quad- rangular chamber. Acknowledgements The author is grateful to Dr R. A. Fortey, Dr. A. W. A. Rushton and Dr. P. M. Allen for discussion and support, and to Dr G. A. Booth for access to his unpublished data. Mrs J. Lines typed most of the manuscript. This paper is published with the permission of the Director, British Geological Survey (). Sample localities 1. OgofHen Formation: Allt Cystanog Member. MPA 20074. 140m at 112° from Star Cottage (SN 4305 1979). Loc. 4b of Owens & Fortey (1982). 2. OgofHen Formation: Bolahaul Member. MPA 20075-6. 10m at 227° from Star Cottage (SN 4291 1981). Loc. 8 Fortey & Owens (1978). MPA 20079. Roman Road, Pensarn. 105 m at 140° from chapel at Pensarn (SN 4141 1911). Loc. 6 of Fortey & Owens (1978). MPA 20080. Roman Road, Pensarn. 80m at 149° from chapel at Pensarn (SN 4137 1914). Loc. 6 of Fortey & Owens (1978). 3. Carmarthen Formation: Cwmffrwd Member. MPA 20077-8. Nantycaws dingle. 410m at 233° from Ty-cerig (SN 4510 1844). Loc. 7 of Owens & Fortey (1982). MPA 20086. Nant y Glasdwr. 50m at 130° from Nant-y-Glasdwr-fach (SN 4239 1756). Loc. 3E of Fortey & Owens (1978). MPA 20087. Nant y Glasdwr. 95m at 131° from Nant-y-Glasdwr-fach (SN 4242 1753). Loc. 3D of Fortey & Owens (1978). 4. Carmarthen Formation: Cwm yr Abbey Member. MPA 20081. Nant y Glasdwr. 40m at 169° from Gwynion Dale (SN 4272 1748). Loc. 3A of Fortey & Owens (1978). MPA 20082. Nant y Glasdwr. 55m at 218
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