Hatcher : Dr.NTiTioNS of Titanothrrium. 2r)7 



above description it will be seen that the anterior border of the parie- 

 tals overlies and encloses laterally the posterior border of the frontals, 

 while the anterior border of the latter has a like articulation with the 

 nasals, the relative position of these bones being similar to that of the 

 shingles of a roof. 



The zygomata are rather broadly expanded and are composed about 

 Cfjually of the malars and squamosals. 



When seen from the side the skull appears somewhat low, with an 

 abbreviated facial region and a rather long posterior portion. The 

 occipital crest and anterior frontal regions are each somewhat elevated. 

 The nasals appear rather deep and send down an inferior and posterior 

 projection, which articulates by suture with the superior border of the 

 maxillary. The infraorbital foramen lies wholly within the maxillary. 

 The maxillonasal suture is opposite the middle of the orbit. The 

 lachrymal is rather large. The malar is long and thin, anteriorly it 

 has an extended contact with the maxillary and posteriorly with the 

 squamosal portion of the zygoma. The squamosal rises high above 

 the external auditory opening and overlaps the side of the parietal 



Fig. I. Posterior view of skull of young Titanothere, one-fourth natural size, No. 

 Il6. SO., supraoccipital; ex.o, exoccipital; b.o, basioccipital ; <>/., epiphyses of 

 occipital condyle; p.m., paramastoid ; x., superior free portion of paramastoid. 



throughout most of its length. There is a long, thin, transversely 

 expanded postglenoid process and a shorter and proportionately 

 stronger posttympanic process of the squamosal. The tympanic is 

 absent, having been lost from the present specimen. The periotic is 



