MACROPODID.E. 225 



gtgantntS (Zimmermann 1 ). 

 Syn. Yerboa gigantea, Zimmermann 2 . 

 Macropus major, Shaw 3 . 



This is one of the largest existing species. The fourth premolar 

 is shorter than the first true molar ; the upper true molars have a 

 longitudinal bridge connecting the anterior talon with the first 

 ridge; the third upper incisor is much larger than either of the 

 others ; the mandibular diastema is long, the ramus being very 

 shallow at this part. The fourth premolar is always shed before the 

 last true molar comes into use, and soon after the first true molar 

 is also frequently lost. The crown of the fourth lower premolar is 

 divided by a vertical groove. The length of the upper true molar 

 series in an individual in which m- 4 is just coming into use is 

 0,048. 



Hob. Australia and Tasmania. 



42642. Fragment of the right maxilla of an immature individual, 

 showing the first four cheek-teeth (pm. 4 broken) in use, 

 and m- 4 partially protruded from its alveolus; from a 

 cave in the Wellington Yalley, New South Wales. Since 

 this specimen agrees precisely in dimensions with existing 

 examples, it is referred to the present species. 

 Presented by the Trustees of the Australian Museum, 1870. 



The following specimens not improbably belong to this species. 



BL 1515 a. Hinder part of the right ramus of the mandible, with 

 the last three true molars; from King's Creek, Clifton, 

 Queensland. Presented by 0. H. Hartmann, Esq., 1884. 



42591. Two fragments of right mandibular rami of immature indi- 

 viduals, one with the last two, and the other with the 

 last three true molars; from a cave in the Wellington 

 Valley, New South Wales. 

 Presented by the Trustee* of the Australian Museum, 1870. 



Macropus titan, Owen 4 . 



This species is closely allied to M. yiganteus, but is distinguished 

 by its superior size, and the very general occurrence of one or more 

 vertical grooves on the hinder surfaces of the lower true molars ; it 



1 Spec. Zool. Geogr. p. 526 (1777). Yerboa. 2 Loc. tit. 



3 Gen. Zoology, vol. i. pt. 2, p. 505 (1800). 



4 In Mitchell's ' Three Expeditions into Australia,' 2nd ed. vol. ii. p. 360 

 (1838). 



PAET V. Q 



