9 6 



THE AMERICAN NATURALIST. [Vol. XXXVII. 



bar. Seeley describes a vertical channel marking the 

 of the angle of the psq + sq persisting downward to the point 



r the quadrate, this groove prob- 

 of the squamosal and prosqua- 



where the bone expands tc 

 ably marks the point of 

 mosal. 



The quadrate is figured by Seeley (figure 10) as a flattened 

 bone with two ascending bars be- 

 neath the psq + sq, the two bars 

 show through an evident breaking 

 away of the thin plate of the cover- 

 ing bone. At the same time it is 

 noticeable that the outer part of 

 the lower edge of the psq + sq 

 comes in contact with the articular. 

 Seeley describes the first of the 

 vertical bars as " distinct from the 

 quadrate below and the squamosal 

 above with which it is in close con- 

 r eK i....of cynnKiMthus. s q S qua- tact " ; the same fact is expressed 

 jogai; t, quadrate ; or, artfcular. After by a line on the quadrate separating 

 Seeley - the lower part from the portion 



bearing the vertical bars. It seems very possible that this upper 

 portion is the lost quadrato-jugal which does not appear on the 

 side of the skull. 



