430 Mr. A. S. Woodward on some Ganoid Fishes LII. — Notes on some Ganoid Fishes from the English Lower Lias. By A. Smith Woodward, F.G.S., F.Z.S., of the British Museum (Natural History). [Plate XVI.]' The accumulated discoveries of many years, preserved in several Museums, afford the opportunity for a revision of our knowledge of the Fish-fauna of the English Lower Lias, and also make known a few interesting forms as yet unrecognized. Having had frequent opportunities of pursuing the subject during the last few years, the writer ventures to offer the following remarks on some of these new and little-known fishes — the result of observations chiefly based on specimens in the British Museum. I. Family Palaeoniscidse. As already remarked by Traquair *, the Palaeoniscidas of the Lias comprise the four fishes described by Egerton under the names of Oxygnathus ornatus, Cosmolepis Egertoni, Thrissonotus Colei, and Centrolepis asper. A fifth genus and species, Lissolepis serratus of Davis, is also described as referable to the same family ; but there seems to be no justi-fication for this determination, and the fish in question has lately been removed to the Eugnathidaj f. Genus Centrolepis. Of the undoubted Palasoniscidge the genus Centrolepis is the most striking and well characterized. It is, however, very rare, there being only three specimens in the British Museum ; and the caudal pedicle and fins still remain un-known. The new examples show that the type species, Centrolepis asper, is not so short and stout as supposed by Egerton ; the fin described as anal being truly one of the pelvic pair, while the marginal rays ascribed to the lower lobe of the caudal fin are undoubtedly those of the anal. Moreover, the scales described and figured in the original notice are all referable to the ventral aspect, those of the flank (PI. XVI. fig. 1) being somewhat deeper in proportion to their * R. H. Traquair, "Ganoid Fishes of the British Carboniferous For-mations," pt. i. (Pal. Soc, 1877), p. 12. J Woodward and Sherkorn, " Catalogue of British Fossil Vertebrata " (1890), p. 77. Complete references to the literature of the subject under consideration will be found in this work.
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