574 



E. B. BRANSON 



Skull — 



Total length 



Length of roof 



Breadth at posterior end 



Breadth at posterior end of nares 



Breadth at posterior end of orbits 



Height at base 



Orbits— 



Length '. 



Breadth 



Distance apart 



Distance from posterior end of skull (median line) 



Distance from anterior end of skull 



Nares — 



Length 



Breadth 



Distance apart 



Distance from anterior end of skull 



Distance from orbits 



Parietal foramen — 



Length 



Breadth 



Distance from posterior end of skull 



Distance from orbits 



Under side of skull. — The parasphenoid is long, slender, 

 expanded posteriorly, and with a long, slender, cultriform process 

 anteriorly. Its greatest length in A is 335 mm , in B 3io mm . The 

 width along the shaft is about 4o mm in A, 38 mm in B. The prevomers 

 articulate with it on each side along the anterior two-fifths of its 

 length. Between the prevomers the width gradually decreases 

 forward to about i5 mm from its anterior end, where it is 8 mm broad. 

 From here to the anterior end its edges are parallel. Its greatest 

 width, 75 mm in A, jo mm in B, is at the posterior end of the palatine 

 foramina. Posterior to this it is nearly semicircular as seen from 

 below, but it sends out a wing-like process on either side that is 

 overlapped by the pterygoid and exoccipital. At the posterior end 

 on the upper side are two elongated oval pits, one on each side of the 

 median line. They are about io mm apart at their closest approach, 

 and extend obliquely backward from the median line. 



In general appearance the parasphenoid resembles that of Meto- 

 posaurus, but differs from it in the rounded posterior part and the 

 slender cultriform process. The posterior part in Metoposaurus 

 diagnosticus, as figured by Fraas, 1 resembles the posterior part in 



1 Paleontographica, Vol. XXXVI, Plate XIII. 



