. Bulletin of the British Museum (Natural History), Geology. THE VERTEBRATE FAUNAS OF THE LOWER OLD RED SANDSTONE OF THE WELSH BORDERS PTERASPIS LEATHENSIS White A DITTONIAN ZONE-FOSSIL BY ERROL IVOR WHITE. Pp. 49-89; P^- 5; 27 Text-figures BULLETIN OF THE BRITISH MUSEUM (NATURAL HISTORY) GEOLOGY No. 3 LONDON: 1950. 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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