40 SYSTEMATIC PALEONTOLOGY 



" The vertical temporoparietal suture does not run along a ridge as in 

 the M. dunnasus, but its superior portion is on a low, obtuse angle. 

 The frontoparietal suture extends posteriorly from the sagittal crest 

 downwards, much posterior to the direction it presents in the C. 

 megalophysum, where its direction on each side is a trifle anterior to 

 transverse. Across the front the suture is coarsely serrate, differing 

 from the sutures of the anterior border of the frontal bone, which are 

 closely and deeply interdigitate, as in the C. megalophi/sum. The super- 

 ficial median part of the frontal is about one-third as long as the corre- 

 sponding part of the parietal. The nasomaxillary suture with the 

 frontal is short in the transverse direction, not reaching the temporal 

 ridge on each side. The frontomaxillary suture then becomes nearly 

 longitudinal for a distance of 50 mm. and then turns outwards for 25 mm. 

 On the opposite side the posterior border of the maxillary is more 

 oblique and extends from the transverse median portion divergent from 

 the line of the temporal ridge, forwards and outwards. The latter is 

 probably the normal direction of the suture. The nasal bones are very 

 narrow, but expand gradually anteriorly. They do not teriiiinate pos- 

 teriorly in an acute angle as they do in the C. msgalophysum and M. 

 durinasus (apparently), but are truncate. The premaxillaries are also 

 narrow at this point. Their posterior extremities are broken off. The 

 glenoid cavity presents downwards. The presphenoid is plane below 

 anteroposteriorly and transversely posteriorly, but is slightly convex 

 below anteriorly. It is hollow. 



MeoMurements. 



mm. 



Length of supraoccipital triangle to occipitoparietal suture 80 



Length of parietal on middle line 60 



Length of frontal on middle line 35 



Width of supraoccipital at base of supraoccipital triangle. .124 

 Width of base of cranium opposite supraoccipital triangle. . 115 



Width of sagittal crest 18 



Width of nasals at base 28 



Width of nasals 140 mm. anterior to base 50 



