Manchester Memoirs, Vol. Ix. (1916), No.%. 5 



is another bone much less closely connected with the 

 parietal, which we shall call the "intertemporal" 1 The 

 anterior end of each parietal is very loosely connected 

 with the frontal, a small square bone having a median 

 suture with its fellow from which it is not separated by a 

 pineal foramen, and playing no part in the margin of the 

 orbit. In front, the frontals are connected with the shield 

 which covers the anterior end of the snout, but of whose 

 structure we are ignorant. 



The orbit lies below the "intertemporal" and frontal, 

 separated from them by two bones, the posterior of which 

 articulates with the whole lateral margin of the " inter- 

 temporal" and to some extent with that of the "supra- 

 temporal." This bone articulates behind with a large 

 element on the side of the face, whose upper margin is 

 separated from the posterior part of the " supratemporal " 

 and the tabular by a space to some extent filled by a 

 bone which will be described in connection with the 

 opercular apparatus. We propose to call this large cheek 

 plate the squamosal. The curve of its upper margin is 

 continued backward by that of another large triangular 

 element which articulates with it in a short suture, below 

 which its anterior border is separated from the posterior 

 border of the squamosal by a small triangular bone 

 which we dq not propose to name. The large element is 

 obviously pre- operculum. The lower margin of the pre- 

 operculum overlaps a small quadrate element the quad- 

 rato-jugal. The lower and posterior quadrant of the 

 margin of the orbit is formed by a bone whose dorsal 

 border articulates with the post-orbital and squamosal, 

 and whose lower edge is covered by the maxilla. As it 



1 We are aware thai the use of this name is strongly to be deprecated, 

 but use it here in order to avoid the introduction of a new term because 

 the whole question is shortly to be considered by a committee of the 

 American Palreontological Society. 



