NEW REPTILES FROM THE UPPER TRIAS 697 



teeth, since all the teeth had fallen from the sockets in this specimen. 

 The teeth are not separated by an extremely thin partition, but have 

 quite an interval between them, in some cases equal to the diameter 

 of the sockets. I feel more confidence in the distinction, however, 

 from the fact that another genus in the collection has the teeth much 

 more closely placed. 



Another form, represented by a complete skull of larger size, in 

 the collection, has the anterior nares apparently placed much further 

 forward than in the present genus, or at least the beginning of the 

 slender beak is much further forward. Yet another skull, of large 

 size and nearly complete, has been nearly freed from its matrix. It 

 measures 960 ^^ in length; the nares are not as far forward as is the 

 front end of the ontorbital opening, though more anteriorly placed 

 than in B. scolopax Cope, and the strongly deflected anterior end of 

 the beak has three large teeth oji each side. The hind teeth are flat- 

 tened and serrate. Still another skull seems different from any of 

 the foregoing. 



S. W. WiLLISTON. 



