. An introduction to the study of mammals living and extinct. Mammals. DISTRIBUTION 131 independently of the mouth and gullet, thus averting the danger of suffocation while the milk is passing do\vn the latter passage. Bistrifjutian.—The existing species of Marsupials are, with the. Fig. 35.—Front view of skull of Sarcopliilus ursinus, showing polyprotodont and carnivorous dentition (Quart. Journ. Geol. Soc. vol. xxiv. p. 313). exception of one family (the Didel])hyklK), limited in geographical distribution to the Australasian region,^ forming the chief mammalian fauna of Australia, New Guinea
. An introduction to the study of mammals living and extinct. Mammals. DISTRIBUTION 131 independently of the mouth and gullet, thus averting the danger of suffocation while the milk is passing do\vn the latter passage. Bistrifjutian.—The existing species of Marsupials are, with the. Fig. 35.—Front view of skull of Sarcopliilus ursinus, showing polyprotodont and carnivorous dentition (Quart. Journ. Geol. Soc. vol. xxiv. p. 313). exception of one family (the Didel])hyklK), limited in geographical distribution to the Australasian region,^ forming the chief mammalian fauna of Australia, New Guinea, and some of the adjacent islands. The Didel- phyidw are almost purely Neo- tropical, one or two species ranging northwards into the Nearctic region. Fossil re- mains of members of this family have also been found in Europe and America in strata of the Eocene and early Mio- cene periods ; and it is probable that at least many of the poly- protodont Mesozoic mammals noticed in Chapter IV. are referable to the Marsupialia. Classification.—In dividing the Marsupials into minor „ „. ^, ^ . ,-,,,, ir i /m ^ Fio. 30.—Front view of skull of Koala {Pluis- grOUpS, it may be observed mlarctus chierms), showing diprotodont and that one of the most ob^^OUS herbivorous dentition (.Quart. Journ. Geol. Soc. distinctive characters among ^ "^' ^"^''''' ' them is derived from the form and arrangement of the teeth. ^ Including the transitional Anstro-Malayan 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 Flower, William Henry, 1831-1899; Lydekker, Richard, 1849-1915. London, A. and C. Black
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