792 PEOF. BALDWIN SPENCER ON A [Nov. 20, 



(3) Sagittal crest strongly developed, resembling that of Dasy- 

 uridffi and species of Didelphys. 



(4) Large size of the squamosal. This is more strongly marked 

 than in any recent marsupial except perhaps Phascolomys. The 

 dorsal suture of the squamosal runs generally parallel to the 

 sagittal crest as in Dasyuridae and does not converge posteriorly as 

 it does in Phalaugeridae. 



(5) The wide sweep and upward curvature of the zygomatic 

 arches, as in Dasyuridae. 



(6) The entire absence of the inflated part of the squamosal, 

 which is characteristic of the Phalangeridae generally. 



(7) The transverse elongation of the glenoid cavity, the down- 

 ward produced plate of boue which forms the boundary is not 

 connected with any structure forming part of the auditory passage. 

 In this respect it agrees with Dasyuridae and Perameles, and 

 differs markedly from the Phalangeridae, amongst which it forms 

 the anterior part of a bony auditory canal. 



(8) The position of the glenoid cavity in reference to the base 

 of the skull. In the relatively high position of this it approximates 

 most nearly to the Phalangeridae, though it is placed somewhat 

 lower than in these. 



(9) The greatest breadth of the frontals is in the cranial part. 

 In this the fossil differs apparently from all recent marsupials. 



(10) The large size of the lachrymals, which meet the nasals as 

 they do in Phascolomys. 



(11) The great width of the nasals. In their general shape the 

 bones are closely similar to those of certain species of Didelphys. 



(12) The forward extension ot the nasals, as in the Phalangeridae 

 and certain Didelphyidae, and in contrast to what obtains amongst 

 the Dasyuridae. 



(13) The very anterior position of the infraorbital foramen. 



(14) The development of a groove running forward from the 

 foramen rotundum to the fossa gasseriana. In this it agrees with 

 Macropus, Sarcophilm, and Dasyurus. 



(15) The structure of the periotic bone, which is quite unlike 

 that of any other marsupial. 



(16) The size and shape of the premaxillae, which are very 

 similar to those of Trichosurus and may probably be regarded as 

 indicating the presence of a fair-sized incisor dentition. 



(17) The relative size of the cranial cavity, which is greater than 

 that in any recent marsupial. 



(18) The great length of the inflected angle of the lower jaw 

 and the height to which it rises. This characteristic marsupial 

 feature is strongly emphasized in the fossil. 



(19) The probable high position of the articulating surface of 

 the lower jaw. 



(20) The remarkable obliquely transverse groove in the lower jaw. 



(21) The strongly marked curved ridge on the under surface of 

 the lower jaw. 



