Implement and Bones of Extinct Kangaroo. 87 



through our collections. They consist of the greater part of a 

 cranium, the symphysial region and part of the horizontal ramus 

 of a lower jaw, portions of three vertebrae of a sacrum, pelvis, 

 humerus, two femurs, tibia, and fibula, together with an almost 

 entire foot. Although the proportions of some of these parts 

 one with another are considerably different from those of their 

 counterparts in existing Macropods, and caution us emphatically 

 against placing unreserved reliance on the accuracy of any refer- 

 ence of an isolated bone with this or that species of extinct 

 kangaroo, they do not exceed in difference what may fairly be 

 attributed to adaptive modification, and are therefore not incon- 

 sistent with the belief that all of them belonged to a single 

 skeleton. They are referable to a species named by the writer 

 Macropus faunus} The cranium in its present condition offers 

 no distinctive characters worthy of note ; any that may have 

 existed originally have been effaced by a complete flattening and 

 distortion of its component bones under incumbent pressure. 

 The intermaxillaries, with their implanted teeth — with the excep- 

 tion of the left outermost incisor — have escaped material injury. 

 The length of the third incisor equals the chord of the arc 

 formed by the two taken together ; this tooth is strongly notched 

 at its anterior two-fifths. The cheek teeth of the same side — 

 those of the right jaw having been destroyed — are all in place 

 and intact ; in structure they agree closely with those of the 

 type of the species, l)ut indicate by their greater degree of wear 

 a more advanced period of age. 



This notwithstanding, the premolar is still firmly in place, 

 and shows no sign of speedy extrusion. The apparent per- 

 manence of this tooth makes it necessary to correct the im- 

 pression conveyed by the words " procumbent on the verge of 

 the^ diastema," in the account given of M. faunus. The writer 

 was evidently misled in concluding from the overhanging position 

 of the type premolar, that it had not long to remain in place. 

 The persistent premolar and elongate notched third incisor 

 associated with roundly lobed and strongly linked molars in 

 iVJ. faunus, are salutary admonishers of the fact that the dental 

 differences shown by Macropus and Halmaturus in modern times, 



1 Pro. Lin. Soc. N.S.W., ser. 1, vol. x., p. 127. 



