438 



The upper border of the occipital foramen (o) is mutilated in the fossil, but seems to 

 have been more arched, less angular, and the foramen to have been less transversely 

 widened than in Macropus major (fig. 3, o). 



The upper and larger ends of the condyles (ib. fig. 2') subside more gradually into 

 the occipital surface, are not defined by a depression there, as in Macropus major (ib. 

 fig. 3). The channel or concavity between the condyle and paroccipital («) is relatively 

 wider in Macropus Titan. In this species the foramen magnum seems as if it had been 

 notched at its upper border, where the exoccipitals may not have met, and where the 

 foramen may have been bounded by an intercalated portion of the superoccipital. 



The basioccipital (Plate LXXIX. fig. 1) is carinate below, as in Macropus major 

 and Macropus rufus (Plate LXVI. fig. 3, i) ; but there is more tumefaction at its suture 

 with the basisphenoid in Macropus Titan. A low crest runs along the sagittal suture 

 (Plate LXXVIII. fig. 1) which bifurcates, the divisions diverging to the postorbital 

 prominences, which, as usual, are feeble. In Macropus rufus (Plate LXVI. fig. 2) at a 

 similar phase of dentition the sagittal suture persists, and the low ridges (7') have not 

 met at the mid line. 



The fore part of the glenoid surface is contributed by the malar, in Macropus Titan, 

 as in other Kangaroos. The outer surface of the zygoma seems not to be so deeply 

 impressed or concave as in Macropus major or Macropus rufus (Plate LXVI. fig. 1, 26). 

 The facial part of the skull anterior to the orbits seems to have been relatively broader 

 in Macropus Titan than in Macropus major ; but there is an oblique crush at the upper 

 part, here, in the fossil, with loss of the outer table of the cranium. The antorbital 

 foramen is relatively further from the orbit in Macropus Titan than in Macropus major ; 

 in this character Macropus rufus more resembles the fossil. The front pier of the 

 zygoma springs more posteriorly than in either of the large existing Kangaroos. 



The bony palate (Plate LXXIX.) is extended further backward, and the production 

 of the alveolar border of the maxillary behind the last molar (m 3) is more convex trans- 

 versely than in Macropus major or Macropus rufus (Plate LXVI. fig. 3, 21"). 



The bony palate is entire in the fossil, and is relatively wider than in Macropus major. 

 The interspace between the right and left ultimate molars in Macropus Titan is two and 

 two thirds of the fore-and-aft diameter of that tooth ; in Macropus major that inter- 

 space is two diameters and one fifth of the same tooth. 



The lower area or outlet of the zygomatic arch is relatively larger in Macropus Titan 

 than in Macropus major; it exceeds the length of the molar series of four teeth (d <, m 1, 

 m 2, m 3) by the length of m 3, in Macropus Titan ; while in Macropus major this outlet 

 does not equal the length of the same series by half the anterior molar (d 4). 



The diastemal border is less obtusely rounded in Macropus Titan than in Macropus 

 major; it resembles more that border in Macropus rufus (Plate LXVI. fig. 3), and in 

 some of the smaller Kangaroos, such as Phascolagus erubescens. 



Of the extent of the diastemal interval in the upper jaw the fractured fore end of the 

 present fossil of Macropus Titan precludes any certain estimate, but I have ascertained 



