242 Annals of the Carnf.gie Museum. 



interesting form, is incomplete. We have a skull, however, and T 

 also find the bones of the extremities. 



Of the Skull : Regarded from above, it is seen that the vault of 

 the cranium, including an area bounded by the occipital ridge, the 

 orbital peripheries, and the anterior terminations of the frontal bones, 

 is smooth, completely convex and rounded, being unmarked by either 

 elevation or depression of any kind. In the frontal region the trans- 

 verse line measuring the shortest distance between the very rounded 

 orbital margins, usually averages about a centimeter and a half. The 

 cranio-facial region is but very slightly depressed, while the fusing of 

 the nasal, maxillary, frontal, to a great extent the lacrymal, and finally, 

 the premaxillary bones as seen upon this view is wonderfully complete. 

 So much is this the case, that the only sutural traces at all evident are those 

 of the premaxillary and of the lacrymals, and even these are very faint. 



The superior mandible is very broad from side to side, and greatly 

 compressed in the vertical direction. It gradually contracts in width 

 as we pass forwards, up to a point about midway between the cranium 

 and its anterior termination ; and at the same rate, it begins to widen 

 again, to finally spread out distally into a broad spatulate extremity, 

 which shows a slight decurvature at its tip. The anterior half of this 

 almost unique structure is perfectly flat and in the horizontal plane, 

 having about the uniform thickness of the blade of a table-knife. The 

 bony external nasal apertures are well forward ; are of medium size 

 and spindleform in outline. They stand about half a centimeter apart, 

 with their major axes parallel to each other, and pierce directly back- 

 wards. As the floors of these openings are laid down in solid bone, 

 and their calibres not large, we can gain through them no view of the 

 rhinal chamber into which they lead. Starting from the anterior apex 

 of either one, we find an indented line passing directly forwards. It 

 sweeps round the margin of the bill within a few millimeters of its 

 free border, to end by abruptly running out at that border at a point 

 slightly to one side of the median one of the apex. These lines are 

 . very sharply defined. 



On the lateral aspect of the skull the post-frontal process is (juite 

 rudimentary, and the scjuamosal one, hardly much larger, is repre- 

 sented by a small, sharp, inturned spinelet. 



The valley of the temporal fossa between them is short but well- 

 marked. An orbit is deep and subcircular in its general form, while 

 the septum separating these two cavities, is entire. 



