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By way of carnivores, the Tasmanian devil is a fierce and savage marsupial analogue of the American wolverine; a smaller species of the same type usurps the name and place of the marten; and the dog-headed Thylacinus is in form and figure precisely like a wolf or a jackal.
So it is with fishes. Numerous cases could be given of striking resemblances in quite distinct beings between single parts or organs, which have been adapted for the same functions. A good instance is afforded by the close resemblance of the jaws of the dog and Tasmanian wolf or Thylacinus animals which are widely sundered in the natural system.
Thrush, pairing with a blackbird; colours and nidification of the. Thrushes, characters of young. Thug, remorse of a. Thumb, absence of, in Ateles and Hylobates. Thury, M., on the numerical proportion of male and female births among the Jews. Thylacinus, possession of the marsupial sac by the male. Thysanura. Tibia, dilated, of the male Crabro cribrarius.
But this resemblance is confined to general appearance, as in the prominence of the canines, and in the cutting shape of the molar teeth. For the teeth really differ much: thus the dog has on each side of the upper jaw four pre-molars and only two molars; while the Thylacinus has three pre-molars and four molars. The molars also differ much in the two animals in relative size and structure.
In the mammalian class the males possess rudiments of a uterus with the adjacent passage, in their vesiculae prostaticae; they bear also rudiments of mammae, and some male Marsupials have traces of a marsupial sack. The male Thylacinus offers the best instance.
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