26 PROCEEDINGS OF THE ACADEMY OF [Feb., 



to have been anterior to the larger piece originally and in line with it, 

 though this would bring the rather large alveoli farther forward than 

 might be expected. If the superior, rod -like portion of the maxilla 

 were turned outward on its axis, so as to bring the alveoli nearly or 

 quite to a vertical position, a space would apparently be left between 

 the premaxilla and maxilla. It is not reasonable to suppose that any 

 such space existed originally. 



In view of the circumstances mentioned above, I think it is unlikely 

 that the real form of the rostrum can be determined until additional 

 specimens have been collected, or at least until the type specimen 

 has been taken to pieces, so that all the surfaces of the component 

 bones can be examined. 



iMIt should be remarked that at the anterior end of the small piece of 

 the maxilla which bears the alveoli there is a space of 19 mm., in which 

 it is obvious that no alveoli existed, and between this and the first 

 alveolus which is traceable is another space of about 25 mm., in which 

 additional alveoli may or may not have existed. In any case, the 

 fragment in question bears the end of the series of alveoli, and, if it is 

 properly oriented, the anterior end. As the fragment bearing the 

 alveoli is much shorter than the rod-like portions of the maxillae above 

 it, this confirms to some extent Cope's assertion that the muzzle "in 

 the greater part of its length forms an edentulous cylinder." 



Measurements of the type-beak of Rhabdosteus latiradix Cope. 



Total length of beak, as restored, 440 mm. 



Greatest breadth of the same, as restored, 39 " 



Length of longest piece of premaxilla preserved, .... 330 " 



Length of longest piece of maxilla preserved, .... 277 " 



Breadth of premaxilla at posterior end, 11 " 



Breadth of premaxilla at anterior end 7 " 



Breadth of portion of maxilla above the alveoli at posterior 



end, 9 " 



Breadth of alveoli at anterior end, 7 " 



Greatestbreadthof palate between alveoli, as restored, . . 21 " 

 Length of the palatal portion of the left maxilla, which con- 

 tains the alveoh, 166 " 



Breadth of the same at the anterior end, 4 " 



Breadth of the same at the posterior end 4 " 



Length of larger palatal fragment (left), which is internal to 



the preceding in the restoration, 193 " 



Breadthof the same at the anterior end, 5 " 



Breadth of the same at the posterior end, 16 " 



Length occupied by nine alveoli, 103 " 



Antero-posterior breadth of largest septum between alveoli, . 5 " 



Antero-posterior breadth of largest alveolus, 7 " 



