258 Annals of the Carnegie Museum. 



present and its paramastoid portion appears externally between the 

 posttympanic and paroccipital processes. Just above this there is 

 another small bone which is continued into a long pointed process in- 

 serted between the exoccipital and the squamosal and parietal ; it 

 probably became coossified later with the periotic, but in the present 

 specimen it is seen as a separate bone, as shown in Fig. i and in plate 

 VII. The exoccipitals are rather large and support the paroccipital 

 processes and the occipital condyles. The latter are ossified from 

 two distinct centers, the articular portions bearing distinct epiphyses, 

 as shown in the accompanying figures. 



Seen from behind the occiput is low and broad. The condyles are 

 widely separated by the foramen magnum, which is much broader than 

 deep. The condyles are entirely supported by the exoccipitals, which 

 rise and meet in the middle line above the foramen magnum, entirely 

 excluding the supraoccipital from any part in the formation of the 

 superior border of that opening. The supraoccipital is very broad and 

 low. The occipital crest is nearly flat above, but broadly emarginate 

 posteriorly. (See Fig. i of the text, and plate VIII.) 



Inferiorly the palate is seen to be formed anteriorly by the very 

 short premaxillaries, for the most part, broken away in the present 

 specimen, and by the maxillaries, between the posterior lateral ex- 

 tremities of which are inserted the palatines. These form the poste- 

 rior median portion of the roof of the palate and send backward on 

 either side a lateral projection along the inner sides of the maxillaries 

 and pterygoids, which are continued nearly to the posterior end of the 

 basisphenoid. 



The vomers are continued far back as a thin plate resting upon the 

 pre- and basisphenoids and sending downward a thin, knife-like me- 

 dian bony septum. The basisphenoid in the present specimen is en- 

 tirely free from the basioccipital, the suture being open, and the basi- 

 occipital had dropped out and was lost before the specimen was found. 

 The absence of the basisphenoid and tympanic bones makes it im- 

 possible to describe and locate the various foramina of this region of 

 the skull. 



The Teeth. 



The present specimen is of especial interest in that both the inferior 

 and superior deciduous and permanent dentitions are shown essentially 

 complete. 



