'210 tHALillGEElD*. 



worn off, and then i.'' and i.' are both about equal, and about one 

 third the size of i.' in cross section. Canine thick and strong, its 

 dentinal root becoming much elongated and swollen in old age. 

 P.* evenly oval, its antero-posterior diameter about equal to that of 

 m.^ with a central ridge and a distinct postero-internal basal ledge. 

 Molars very broad, about as broad as long, each with four sharp 

 pointed cusps with curved ridges radiating from them, their structure, 

 in fact, very like that found in Petawoides and Pseudochirus. Lower 

 incisors narrow, deep antero-posteriorly. Lower p.* sharp-edged, 

 its central ridge bifurcated posteriorly. Molars with sharp curved 

 crests, their convexity outwards. 



Tooth-change nearly obsolete, the milk-p.*, both above and below, 

 reduced to a minute rudiment, apparently quite functionless. 



Range. That of the only species. 



1. Fhascolarctus ciuereus. 



Koala, G. Cuv. S. A. i. p. 184, iv. pi. i. fig. 5 (animal) (1817) ; 



Besm. N. Diet. d'S. N. (2) xvii. p. 110 (1817). 

 Lipurus cinereus, Ooldf. Isis, 1819, p. 274 ; Schim, Ouv. Thiei-r: i. 



p. 265 (1821); Bv/i-m. Lehrb. Naturg. p. 547 (1830); Owen, 



P. Z. S. 1838, p. 154. 

 Morodactylus cinereus, Ooldf. Zool. ii. p. 445 (1820). 

 Phascolarctus fuscua, besm. Mamm. i. p. 276 (1820) ; id. Diet. Sci. 



Nat xxzix. p. 448 (1826) ; J. B. Fisch. Syn. Mamm. p. 284 



(1829) ; MarUn, P. Z. 8. 1836, p. 109 (anat.) ; Waterh. Cat. 



Mamm. Mus. Z. 8. p. 68 (1838) ; id. Jard. Nat. Lib?:, Mamm. xi. 



p. 295, pi. xxxi. (animal) (1841) ; Less. N. Tdbl. R. A., Mamm. 



p. 192 (1842) ; Wagn. Schr. Sdug. Sv/pp. iii. p. 94 (1843), v. p. 281 



(1865) ; Owen, Odontogr. Mi. pi. c. fig. 6 (teeth) (1845). 

 Phascolarctus koala, Cfray, Oriff. Cuv. An. K. p. 205 (1827) : Oerv. 



H. N. Mamm. ii. p. 273, pi. (animal) (1855). 

 Phascolarctus flindersi, Less. Man. Mamm. p. 221 (1827). 

 Phascolarctus cinereus, J. B. Fisch. Syn. Mamm. p. 285 (1829) ; , 



Oray, List Mamm. B. M. p. 87 (1843) ; Wagn. Schr. Sdug. Supp. 



iii. p. 95 (1843) ; Schinz, Syn. Mamm. i. ■^. 637 (1844) ; Waterh. 



N. H. Mamm. i. p. 259, pi. ix. tig. 2 (animal), and pi. xx. fig. 5 



(skull) (1846) ; Kombr. §• Jacq. Voy. Pole Sud, Zool. p. 35, Atl. 



pis. xvii. & xvii. A. (animal, skull, and skeleton) (1845-53) ; Qould, 



mamm. Austr. i. pis. xiii. & xiv. (animal) (1854) ; Gerv. H. N. 



Mamm. ii. p. 273 (1866); Oieb. Sang. p. 698 (1859); Benn. 



P. Z. S. 1862, p. 85; Gerrard, Cat. Bones Mamm. B. M. p. 123 



(1862) ; Krejffi, Cat. Mamm. Austr. M«s. p. 44 (1864) ; id. Mamm. 



Austr. pi. vi. (animal) (1871); ScMeg. Bierent. p. 167 (1872); 



Young, J. Anat. Phys. xiii. p. 305 et seqq. pi. xviii. (anat.) 



(1879) ; Sclater, P. Z. S. 1880, p. 355 ; Brekm, Thierl. ii. p. 579 



(1880) ; Forbes, P. Z. S. 1881, p. 181 et seqq. figs. 1-6 (anat.) ; 



Bobs. J. Anat. Phys. xvii. p. 151 (1882) ; Flow. Fna/cl. Brit. (9) 



XV. p. 382, figs. 25 (skull) & 32 (bones of foot) (1883) ; Flow. 



8f Oars. Cat. Ost. Coll. Surg. ii. p. 699 (1884) ; Thos. P. Z. S. 1887, 



p. 338, fig. 1 (tooth-change) ; Coll. Zool. Jahrb. ii. p. 935 (1887) ; 



Jent. Cat. Ost. Leyd. Mus. p, 307 (1887). 



Koala. 



