so 



S. W. WILLISTON 



specimen there are several osseous plates. Those of the left orbit 

 seem complete; they form a continuous, convex surface, occupying 

 more than half the diameter of the orbit. The plates are five 

 or six in number; they are not arranged in a ring about a pupillary 

 opening, but the surface is continuous. They could not have been 

 sclerotic plates, and it seems not at all improbable that they were 

 merely ossifications in a nictitating membrane, and served for the 

 protection of the eyeball. The parietal foramen is of the usual size 



Ftg. I. — Broilielliis texensis Williston. 

 size. No. 684, University of Chicago. 



Skull, from above, three-fourths natural 



and is situated a little distance behind a line drawn through the 

 hind margins of the orbits. 



The otic notch is large, occupying most of the postero-lateral 

 surface of the skull, and extending forward fully two-thirds the 

 distance to the hind margin of the orbit. The ear-opening itself 

 is rather large, extending forward more narrowly nearly to the 

 front margin of the notch. Below the opening there is a broad, 

 smooth surface, looking obliquely upward, backward, and outward. 

 The excavation throughout is quite like that in the species from New 

 Mexico provisionally referred to Aspidosauriis under the specific 



