EASTMAN: MYLOSTOMID PALATAL DENTAL PLATES. 265 



of Hussakof s so-called Dinognatlius ferox. An inspection of Figure 2, 

 in which no reduction in scale nor alteration of the natural outlines has 

 been necessary, will couvince one of the harmonious coadaptation of 



Fig. 2. Proposed reconstruction of Dinognathus type of dentition, showing cor- 

 respondence in area and outline between the mutually interacting parts (upper 

 and lower dental plates). The missing posterior palato-pterygoid element is 

 restored from analogy with Mylostoma variabile. x f . 



parts. The existence of a posterior pair of palato-pterygoid dental 

 plates in this new Mylostomid genus may be regarded as an abso- 

 lute certainty, and the presence of vomerine teeth as a reasonable 

 presumption. 



