MAESTJPIALIA. 



wide; the longitudinal bridge connecting the ridges being very 

 imperfect, and the anterior talon of the upper molars unconnected 

 by such a bridge with the first ridge. The mandibular symphysis 

 is not anchylosed, and the lower incisors are of the macropine 

 type. 



The genus connects Macropus with Procoptodon. 



Sthenurus atlas, Owen \ 



Syn. Macropus atlas, Owen 2 . 



Protemnodon anak, Owen 3 (in par e). 



This is the type and only species 4 , and is nearly of the size of 

 Macropus anak. The type mandible is figured in the ' Phil. Trans.' 

 1874, pi. xxii. figs. 3, 4, and in the ' Extinct Mammals of Australia,' 

 pi. Ixxxii. figs. 3, 4. 



Hob. Queensland and New South Wales. 



42592. Part of the left maxilla of a young individual, showing 



(Fig.) pm. 3, mm. 4, and m. 1 in use, and the germ of m- 2 in 



alveolo; from a cave in the Wellington Valley, New 



Fig. 37. 



Sthenurus atlas. Part of left maxilla of a young individual ; from a cave 



in the Wellington Valley. \. 



South Wales. This specimen (fig. 37) agrees with the 

 examples figured in the ' Phil. Trans.' 1874, pi. xxiii. 

 figs. 4-9 ('Extinct Mammals of Australia,' pi. Ixxxiii. 

 figs. 4-9), under the name of Protemnodon anak. The 

 third premolar, although relatively shorter, agrees in 



tooth of M. anak, instead of with the present form, to which he referred the 

 upper jaw of M. anak. In his earlier ' Catalogue of Fossil Mammalia in the 

 Museum of the College of Surgeons,' the above-mentioned maxillae were correctly 

 referred to M. atlas. Owing to this confusion the upper jaws of several species 

 of Macropus were referred to Sthenurus, and their lower jaws to the so-called 

 Protemnodon, which was really founded upon the upper jaw of Sthenurus atlas. 

 1 In Mitchell's ' Three Expeditions into Australia,' 2nd ed. vol. ii. p. 359 

 (1838). Macropus. 2 Lo C . cit. 



3 Phil. Trans. 1874, p. 275. 



4 The other species referred by Owen to this genus belong to Macropus. 



