52 BONE BRECCIA DEPOSIT, 



There appears to be no upper ni'*, while the rudimentary lower 

 m* is apparently variable. The dental formula shows much 

 resemblance to that of Hypsijirymnudon as regards the upper 

 teeth, but in the possession of the two small teeth between i^ and 

 p'' there is considerable difference in the lower jaw. As regards 

 the number and arrangement of the teeth in the lower jaw the 

 agreement with some of the smaller Phalangers is very marked; 

 Dromicia nana, for example, having an entire dental formula 

 almost exactly like that of BarramyH. To Drumicia nana 

 there is also a marked resemblance in the lower minute teeth and 

 some resemblance in the molars. 



A considerable fragment of the skull gives a fair idea of the 

 outline, but adds little to the settlement of the affinities of the 

 genus. The skull has been apparently sharp-snouted as in 

 Petaurus or Dromicia. The lacrymal foramen is placed distinctly 

 in front of and beyond the orbit. The infraorbital foramen is 

 large, and placed in front of the large premolar — in this resembling 

 the condition in the Phalangers and differing from the normal 

 Macropod arrangement. The interorbital region of the skull is 

 comparativel}'^ broad, but there is no distinct supraorbital ridge. 

 The olfactory lobes of the brain have been well developed, and 

 the whole brain appears to have been relatively large. The 

 zygomatic arch passes out from the maxilla in the usual manner: 

 it arises near the posterior part of the large premolar and is com 

 paratively slender. 



Petaurus breviceps, Waterh. 



Some time ago I found an imperfect fragment of a lower jaw, 

 with the roots of three teeth in position. Though the fragment 

 Avas manifestly that of a Petaurus and in. size agreed with P. 

 breviceps, I hesitated to refer it definitely to that species on such 

 imperfect evidence. Since then I have found a fragment of the 

 cranium with the frontal bones almost perfect, and from the size 

 and the formation of the supraorbital ridges, there is no doubt in 

 referring the specimen to P. brevicejjs, and there is little doubt 

 but that the lower jaw fragment also belongs to this species. 



