382 Mr. A. S. Woodward on the 



tremelj delicate wing* of bone probably of the form indicated 

 by the dotted line in the figure. It is also interesting to 

 note that the bone is pierced by a short vertical canal exactly 

 as in Ami'a, the upper opening (/.) being on the inner, the 

 lower opening on the outer face. The quadrate of. the left 

 side is nearly complete and is remarkable for the very large 

 size of the articulation for the mandible, which is much 

 elongated antero-po.steriorly. The hinder margin is a little 

 curved outwards and thickened, and remains of a tuberculated 

 external plate are crushed upon this prominence. Of the 

 pterygo-palatine arcade only fragments are preserved ; but it 

 may be said that these laminar bones bear clustered patches 

 of teeth, which are small near the margin of the jaw and 

 become merely minute tubercles or granulations beyond. 

 One piece of bone, which seems to have been ])alatine, bears 

 an irregular cluster of teeth as large as those of the spleuial. 

 The imperfect right maxilla (PI. XI. tig. 2) shows that this 

 element is very long and narrow, the dentigerous border 

 being somewhat concavely arched and furaishel with a single 

 close series of large teeth, which are largest in the middle of 

 the bone, and all seem to be approximately circular iu trans- 

 verse section. The outer face is very coarsely rugose and 

 seems to have formed a little parapet outside the bases of the 

 teeth, as indicated by a fragment behind, wiiich is acciden- 

 tally overlain by another piece of bone {x). There is some 

 indication of a surface of overlap for the supramaxilla. The 

 mandible is also remarkably long and slender, but is known 

 only by the ))ortion of the left ramus shown of two Hfths the 

 natural size irom the outer and superior aspects in PI. XI. 

 figs. 3, 3 a. The dentary {</.) beai'S a single close series of 

 teeth still larger than those of the maxilla, but they are 

 unfortunately only indicated by their bases, which are ovoid 

 in shape, with the long axis coincident witli that of the jaw. 

 The outer face of the bi)ne is coarsely and irregularly rugose, 

 and its lower portion is a thin vertical lamina witii an acute 

 inferior border. The spleuial (s/jl.) is comparatively robust 

 and forms a broad ledge on which small teeth are irregularly 

 clustered, but it is broken in front, and its precise extent is 

 unknown. 



Very few traces of the check-plates remain, and nothing 

 is known of their arrangement. Like the other external 

 bones, all are destitute of enamel on the tubercular or rugose 

 ornament. A fragment of the anterior border of the left 

 operculum is almost smooth, though with irregular surface. 



