THE PHYTOSAURIA OF THE TRIAS 



159 



is the only form in which the opening has been noted. In conver- 

 sations with him, Dr. WilHston has expressed the opinion that the 

 opening is accidental in this case. One should probably not lay 

 too much stress on its presence in this form till it has been found 

 in other members of this genus. The parieto-squamosal arcade is 

 crushed and largely broken away, giving an appearance to the 

 supratemporal fenestra much like that of Mystriosuchus planiros- 

 triis. Whether this is the true condition or whether the form is like 



\^ 



/^' 



^^ 



Figs. 19-20. — -Ilia of a new, unnamed form. The ilium shown in Fig. 19 was 

 referred by Lees to Palaeorhinus bransoni. Both figures about one-half natural size. 



that of Angistorhinus as described above is not certain. The writer 

 is inclined to agree with Lees, however, in assigning to it the form 

 of the latter, but this view should probably also be held as tentative. 

 It has been impossible to ascertain the association of the ilium 

 figured with the skull of Palaeorhinus."- Material has recently come 

 into the hands of the writer which shows that the ilium is not that 

 of Palaeorhinus as Mr. Lees supposed, but belongs to an entirely 

 different group of reptiles. Fig. 19 is of the same ilium figured with 



^ Lees, op. cit., Fig. 8. 



