.28 



H. Gt. SEELET ON KHAMPHOCEPHALTTS PKESTWICHI. 



overlapped the posterior portion of the parietals and curved with 

 them backward and outward. There is on the lateral portions of 

 the parietal a slight impression of the bone, which also suggests to me 

 this interpretation. The pa- 

 rietal (p) terminates anteriorly Cast of upper surface of Shull of 

 in a transverse suture in which Ehamphocephalus Prestwichi, 

 it joins the frontal bones (/) ; natural size. 

 this suture is nearly straight, 

 being curved slightly backward. 

 The length of the parietal bone 

 is exactly 3 centimetres ; its 

 posterior width, as preserved 

 (which is less than the real 

 width), is about 25 millimetres ; 

 'the greatest constriction of the 

 bone from side to side just in 

 front of the notches appears to 

 be about 8 millimetres or rather 

 more, while the anterior width 

 of the bones at their union with 

 the frontal bones is 23 milli- 

 'metres. 



There is a moderate trans- 

 verse depression on the skull 

 where the parietal bones join 

 the frontal. Unfortunately 

 there is no indication of the 

 character of this long cerebral 

 region, though it is evident that 

 there was a concavity below the 

 slender squamosal arch. The 

 parietal appears where it joined 

 the frontal bone to have given 

 attachment to the postfrontal, 

 at the back of the orbit, in the 

 usual way ; but, apparently 

 from the sharp downward curve 

 of the postfrontal bone, no trace 

 of it is preserved. The width 

 of its union with the roof -bones 

 o1^ the skull was about 5 milli- 

 metres. The frontal bones 

 measure in length 18 milli- 

 metres, are greatly constricted 

 in the orbital region and cupped 

 with almost semicircular bor- 

 ders for the orbits. The width 

 of the interorbital part of the frontal 

 bones is 5 millimetres, and the 

 extent of the bone posterior to the orbit at its outer border is 4 mil- 



ox, articular surface for occipital bone 

 parietal ; /, frontal ; o, orbit ; ^/, pre- 



