152 MAURICE G. MEHL 



OPENINGS OF THE PALATE 



The length of the internal nares is 71 mm., about 8 mm. greater 

 than that of the external openings. The internal nares are about 

 20 mm. in advance of the externals at their posterior border. 



The postpalatine foraminae are exceptionally small and incon- 

 spicuous. They are, in fact, little more than slight depressions 

 or cracks along the palatine-ectopterygoid union. They are not 

 over 30 mm. long and if actually perforating the palate are not 

 more than 3 mm. wide. 



The inter pterygoid openings are exceptionally small. Their 

 exact anteroposterior extent cannot be determined, but they could 

 have been but little more than 25 mm. long. 



THE BONES OF THE PALATE 



Some of the details of the relations of the bones of the palate 

 are not at all certain. In the palate restoration, the writer has 

 attempted to show the relation as the weight of the evidence seems 

 to indicate and not as indisputably determined. 



The premaxillae apparently have a remarkable posterior extent 

 on the palate surface. They seem to form the anterior border 

 and the entire inner boundary of the internal nares and extend a 

 short distance back of these openings along the median Hne. An 

 unpublished drawing of this specimen by S. W. Williston doubtfully 

 places the posterior end of the premaxillae about 40 mm. in front 

 of the internal nares. The bone in this region is platey and brittle 

 and has been somewhat abraded in preparation. The writer 

 recognizes the possibility of the premaxilla-vomer suture in this 

 region, but cannot verify this point. 



The maxillae extend forward on the palate surface to the 

 twenty-fourth tooth, numbering from the front. Their width 

 on the palate is at no place much greater than that required for 

 the alveolar ridges. The union with the jugal as seen in a palate is 

 not determinable. 



The vomers seem to be exceptionally small and confined to the 

 posterior and possibly the posterolateral borders of the internal 

 nares. This is a condition decidedly unlike that usually attributed 

 to the phytosaurs and is merely suggested. What is assumed to be 



