64 
Attention should be drawn, however, to certain features, such as the 
roofing over of the narial passages; the advanced position of the external 
nares; the excavated narial depressions, and the general conformation of 
the whole beak; and the receding facial slope; which have their closest resem- 
blance in the contemporary Cheneosaurus. These features probably 
represent a parallel development of two distinct lines of descent, for other- 
wise, so far as they can be contrasted, these genera show no particularly 
close affinities. 
