Catalogue of the fossil fishes in the British Museum (Natural History) .. . Diagram of the oral aspect of the left palatine tooth in the principal generaof Chirnaeridag, showing the arrangement of the tritors.—1. Ischyodus. 3. Edaphodon. 4. Callorhynchus. 5. Elasmodus, 6. Chi- Fig. Diagram of the inner aspect of the left mandibular tooth in the principal generaof Chimaeridse, showing the arrangement of the tritors and the extent ofthe symphysis. Nos. as in fig. 6, with addition of 7- Elasmodectes. CFTTM iERTD M. 55 Genus GANODUS, Agassiz (emend. A. S. W.)1. [Poiss. Foss. vol. i
Catalogue of the fossil fishes in the British Museum (Natural History) .. . Diagram of the oral aspect of the left palatine tooth in the principal generaof Chirnaeridag, showing the arrangement of the tritors.—1. Ischyodus. 3. Edaphodon. 4. Callorhynchus. 5. Elasmodus, 6. Chi- Fig. Diagram of the inner aspect of the left mandibular tooth in the principal generaof Chimaeridse, showing the arrangement of the tritors and the extent ofthe symphysis. Nos. as in fig. 6, with addition of 7- Elasmodectes. CFTTM iERTD M. 55 Genus GANODUS, Agassiz (emend. A. S. W.)1. [Poiss. Foss. vol. iii. 1843, p. 339.] Syn. Leptacanthus, L. Agassiz, ibid. 1837, p. 27 (in part).Psittacodon, L. Agassiz, ibid. 1843, p. 340 (in part). An imperfectly known genus comprising species only of smallsize. Mandibular tooth as in Ischyodiis. Palatine tooth robust,with a well-defined hard layer upon the outer aspect immediatelyabove the oral margin ; posterior border deeply notched, the sinuscontinued forwards as a median longitudinal groove, graduallybecoming shallower, and separating the inner from the outer tritors;inner tritors forming a narrow longitudinal band, more or less dis-continuous ; outer tritors similar, but smaller, and the two seriesusually connected anteriorly. As remarked by Agass
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