A SMALL Arthropod was discovered by one of us (S. H. J.) in the course of investigations of the Coal Measures of the area around Ammanford, Carmarthenshire, on the north crop of the South Wales Coalfield. It is preserved in a fine grained, light blue shale from the roof of the Little Vein (lower part of the Pulchra Zone of Davies and Trueman), at the Blaina Colliery, Pantyffnon, about one mile south-west of Ammanford. The specimen is in the collection of the University College of Swansea, No. A. 152.
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Dix et al. (1932) studied this question.
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