Palæont. [ad. mod.L. Thȳlacothērium, f. Gr. θύλακο-ς pouch + θηρίον beast.] An extinct mammal of the genus Thylacotherium, also called Amphitherium (see AMPHITHERE), variously supposed to have been a marsupial or an insectivorous placental. Hence Thylacotherian a.
1838. Owen, in Proc. Geol. Soc., III. 17. Objections against the mammiferous nature of the Thylacotherian jaws. Ibid., III. 19. In the position of the dental foramen, the Phascolothere, like the Thylacothere, differs from all zoophagous marsupials.
1850. Broderip, Note-bk. Naturalist, viii. (1852), 165. There cannot have been any very wide zoological interval between the forms of the thylacine and of the thylacothere.
