TEICLEIDUS SEELEYI. 



155 



metrically on both sides and the resulting surfaces look like the faces of a suture. Of 

 the two parts the inner (qJ) is the smaller and is narrow from side to side ; its inner 

 border bears a deeply hollowed and roughened surface for union with the posterior end 

 of the pterygoid ; distally it bears the surface for the inner third of the articulation of 

 the mandible [cond.), this surface being strongly convex from before backwards and. 

 slightly so from side to side. The outer border, \^here union with the larger outer 



Test-fisr. 75. 



-cond. 



Left squamosal and quadrate of Trichidus seeleyi, from outer side (E. 3539, nut. size.) 



cond., condyle for mandible ; q., outer portion of quadrate (? quadrato-jugal) ; 5.', inner portion of quadrate ; 

 sq., zygomatic bar of squamosal ; sq.', parietal bar cA squamosal. 



element (q.) takes place, is irregularly roughened, the two uniting in a partly over- 

 lapping suture. The outer two-thirds of the articular surface for the mandible is borne 

 by the second, larger element ; this surface is strongly convex from before backwards, 

 very narrow at the junction of the two elements, but widening towards its outer side. 

 Externally there is a pointed process, and on the upper edge of this, and on the long 



x2 



