MACKOPODLD.B. 207 



Including: Halmaturus, Illiger *. 

 Petrogak, Gray 2 . 

 Lagorchestes, Gould 3 . 

 Osphranter, Gould 4 . 

 Onychogale, Gray '. 

 Phascolagus, Owen 6 . 

 Protemnodon, Owen 7 (inparte). 

 Sthenurus, Owen 8 (in parte). 



The mandibular symphysis is not anchylosed, the diastema is long, 

 and the ramus not excessively deep. The fourth upper premolar 

 has a secant edge, and an inner basal ridge or tubercle, the corre- 

 sponding lower tooth being simply secant : and these teeth may bo 

 either longer or shorter than the first true molar. The true molars 

 do not show a number of vertical ridges. The lower incisors arc 

 spatulate, and those of opposite sides can frequently be moved 

 against one another. Palatal vacuities are present in some of the 

 smaller forms. The fore limbs are much shorter than the hinder 

 ones. 



The writer follows Flower in including all the above-mentioned 

 living forms in the type genus. Other writers on recent zoology 

 retain, however, Petrogale, Onychogale, and Lagorchestes as generic 

 terms, but such a classification is often inapplicable to the fossil forms. 



It will be shown in the sequel, that all the upper jaws described 

 by Owen under the name of Sthenurus, and the lower ones as Pro- 

 temnodon, indicate large Wallabies belonging to the present genus ; 

 although the genus Sthenurus, as defined below, is a valid one. 



Macropus brehus (Owen) 9 . 



Syn. Sthenurus brehus, Owen 10 . 

 Protemnodon mimas, Owen ". 

 Macropus mimas, Flower 12 . 



Owing to the confusion with regard to the upper dentition of 

 Sthenurus atlas (q. .), the upper jaws of the present form were referred 

 by Owen to that genus, while the mandibles were made the types of 

 the so-called Protemnodon mimas. A comparison of the mandible 



Prodr. Syst. Mamin. et Avium, p. 80 (1811). 

 Charlesworth's Mag. Nat. Hist. vol. i. p. 583 (1837). 

 Monograph of Macropodidae, pt, i. (1841). * Op. cit. 



In Grey's Australia, vol. ii. App. p. 402 (1841). 

 Phil. Trans. 1874, p. 261. 



Ibid. p. 274. 8 Ibid. p. 2G-J. 



Ibid. p. yi'J.Samurus. 10 ioc. cit. 



Ibid. p. 278. 

 s Cat. Vert, Anim. Mu 3 . E. Coll. Surg. pt. 2, p. 720 (1884). 



