536 MOODIE. [Vov. XIX. 
Stegocephala but the correlation of the other elements is 
not so definite. Pollard is of the opinion that the post-subor- 
ital (postorbital) of fishes is homologous with that of the 
Stegocephala and it probably is. Baur was inclined to cor- 
relate the epiotics and supraoccipital of the Stegocephala 
with the supratemporal elements of the fishes and the ar- 
rangement of the lateral line canals substantiates his sug- 
gestion. He also would correlate the supratemporal (pro- 
squamosal) with the preoperculum of the Amiadiz and the 
quadratojugal with the suboperculum. The lateral line canals 
of the Stegocephala offer nothing which would contradict 
this view, so far as I am aware. The squamosal has been 
shown above to be the squamosal of the fishes, so that we 
have a nearly complete correlation of the elements of the 
Stegocephala with those of the fishes and more especially 
the Amia. 
Maggi has offered some interesting suggestions with re- 
gard to the correlations of the elements of the stegocephalan 
skull with those of the higher forms and he would even go 
so far as to correlate the epiotics of the Stegocephala with 
the interparietal of man (26). While I have no reasons to 
doubt his conclusions in regard to some of the correlations 
yet I doubt his statements in regard to the cranial structure 
of Archegosaurus and Loxomma. If I understand Maggi 
correctly his homologies are, in large part, based on the as- 
sumption of the fusion of several of the cranial elements in 
the Stegocephala. I doubt very much if there has ever 
been a true case of the fusion of the cranial elements of the 
stegocephalans proved. Jaekel (27) thought he had a case 
of such a fusion in the skulls of Diceratosaurus punctolineatus 
Cope from the Carboniferous of Ohio, but in a perfect skull 
of a closely allied species of this genus I find the elements 
all clearly separated, as one would expect. Maggi is also 
inclined to doubt, according to Allis, the correlation of the 
occipital cross-commissure in the fishes and stegocephalans. 
It has been definitely shown above, I believe, that the canals 
are homologous in the two groups. 
