. An introduction to the study of mammals living and extinct. Mammals. PHALANGERID^ 157 Eucalyptus trees, on the buds and tender shoots of which it feeds, though occasionally descending to the ground in the night. Extinct Phalangeroids. Numerous imperfect remains recently described by De Vis are regarded as indicating large extinct types of Phalangerklce, but further evidence is required before all these determinations can be definitely accepted. Thus part of an upper jaw is provisionally referred to a large species of Pseudochirus, while part of a scapula is made the type of a genus Archizonu
. An introduction to the study of mammals living and extinct. Mammals. PHALANGERID^ 157 Eucalyptus trees, on the buds and tender shoots of which it feeds, though occasionally descending to the ground in the night. Extinct Phalangeroids. Numerous imperfect remains recently described by De Vis are regarded as indicating large extinct types of Phalangerklce, but further evidence is required before all these determinations can be definitely accepted. Thus part of an upper jaw is provisionally referred to a large species of Pseudochirus, while part of a scapula is made the type of a genus Archizonurus which appears to be. Fig. 50.—The Koala (Fhascolarctus cinsreus). From Sclater, Proc. Zool. Soc. 18S0, p. 355. allied to the former. Another fragmentary scapula is considered to indicate a large Phalanger. Finally, part of a fibula described under the name of Koalemus is regarded as affording evidence of the former existence of a large ancestral form allied to the Koala, and it is suggested that an upper jaw with teeth may belong to the same or an allied type. Thylacoleo}-—Dentition of adult: if, c-J-, j3-|, m-J; total 28. First upper incisor much larger than the others; canine and first two premolars rudimentary. In the lower jaw the two small anterior premolars are functionless, and often deciduous ; posterior premolars of both jaws formed on the same type as those of Potorous, but relatively much larger; true molars rudimentary, tubercular. One species, T. carnifex. This animal presents a most anomalous 1 Owen, in Gervais's Zool. ei Pal. fran(;aises, 1st ed. pt. i. p. 192 (1849-52).. 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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