10 Watson, The larger Coal Measure Amphibia. 



similar relations to the basisphenoid, parasphenoid and 

 maxilla. There is the same row of small teeth parallel to 

 those of the maxilla with larger teeth inside them, and 

 the pterygoid is covered with the same shagreen of fine 

 teeth. 



Examination of these primitive and extremely well- 

 preserved skulls seems to shew that the ordinary idea of 

 the autostylism of the Tetrapoda is incorrect in postulating" 

 a connection between the pterygo-quadrate cartilage and 

 the otic region. It is, I think, c|uite certain that there 

 never was such a cotmection in primitive forms, except 

 through the dermal bones of the temporal region. The 

 lower attachment with the basisphenoid I have just 

 shown to exist in Crossopterygians, which are hence 

 " amphistylic," in a different way to Notidanus. 



The lower jaw of " Loxomvia " is almost completely 

 known from the material in the Newcastle Museum. The 

 general form was well shewn by Embolton and Atthey, 

 but, as was to be expected from the date of their work, 

 they did not fully understand its structure. 



The Dentary meets its fellow in a loose symphysis 

 and extends a long way backwards, ending in a point 

 received in a groove in the outer side of the surangular. 



The Splenial (= infradentary) is a comparatively 

 small bone having a small symphysis with its fellow and 

 extending back along the lower edge of the dentary 

 which largely overlaps its outer surface until it terminates 

 by overlapping the angular. 



The Angular, as usual, forms the angle of the jaw, the 

 sutures separating it from the surangular and prearticular, 

 meeting low down at the back of the jaw. The sur- 

 angular is a large bone covering much of the outer side 

 of the articular and running forward, overlapped by the 

 angular, until it is finally cut out by the overlapping 



