. Catalogue of the fossil Mammalia in the British museum, (Natural History). Mammals, Fossil. 258 MAESTJPIALIA. Genus TRICONODON, Owen K Including Triacanthodon, Owen ^. The characters of the genus are those of the family. The discovery of specimens of Triconodon mordaoc with four true molars has shown that the so-called Triacanthodon is not separable. In the American Upper Jurassic a species of this genus is recorded by Marsh ^, the genus Priacodon being made for an allied form. Triconodon mordax, Owen \ Syn. (?) Triacanthodon serrula, Owen'. This is the type species ; the length of the space
. Catalogue of the fossil Mammalia in the British museum, (Natural History). Mammals, Fossil. 258 MAESTJPIALIA. Genus TRICONODON, Owen K Including Triacanthodon, Owen ^. The characters of the genus are those of the family. The discovery of specimens of Triconodon mordaoc with four true molars has shown that the so-called Triacanthodon is not separable. In the American Upper Jurassic a species of this genus is recorded by Marsh ^, the genus Priacodon being made for an allied form. Triconodon mordax, Owen \ Syn. (?) Triacanthodon serrula, Owen'. This is the type species ; the length of the space occupied by i^TTT + m. 2 in the type specimen is 0,095, and that by ^7T + mr2 + mTS 0,008. At least in many adult specimens there were four lower true molars, but it is not improbable that in other examples ^^ was never developed. Hah. Europe (England). The following specimens (or their originals) luere obtained from the Middle FurbecJc group of Durdlestone Bay, Swanage, Dorset- shire. 47766. The nearly entire left ramus of the mandible of a subadult (Fig.) individual, containing the anterior teeth and the first three true molars. This specimen (woodcut, fig. 38) is the type, Fig. Triconodon mordax- The left ramus of the mandible (reversed): from the Purbeck of Swanage. \. and is figured by Owen in the ' Encyclopaedia Britannica,' 8th ed. vol. xvii. p. ] 61, fig. 86, and in his ' Mesozoic Mammalia,' pi. iii. figs. 7, 7a. Beclcles Collection. Purchased, 1876. ' Encyclopasdia Britannica, 8th ed. vol. xvii. p. 161 (1859). ^ Mesozoic Mammalia (Mon. Pal. Soc), p. 72 (1871). ^ Amer. Jouru. ser. 3, vol. xxxiii. p. 343 (1887). * Encyclopaedia Britannica, loc. cit. " Mesozoic Mammalia, loc. 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). Dept. of Geology; Lydekker, R
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