i6 



PERMO-CARBONIFEROUS VERTEBRATES FROM NEW MEXICO. 



slightly wider than long. In all probability a more complete knowledge of the 

 form will show that the distinctive characteristics are of family value. (See fig. 7.) 

 The laterally directed orbits of Chenoprosopus are strongly suggestive of a 

 terrestrial life. The sharp, conical teeth of the maxillaries and the tubercle- 

 studded ridges on the posterior part of the palate would fit the animal admirably 

 for feeding on the worms and the larvae of the gigantic insects of its time. 





Fig. 7. — Chenoprosopus miUeri, X %. 



A, outline of skull, lateral view: pmx, premaxilla; smx, septomaxilla; na, nasal; mx, maxilla; /, lachry- 

 mal ;/r, frontal; pjr, prefrontal; 0, orbit; pt}, postfrontal; pto, postorbital; pa, parietal; ju, jugal; ptr, ptery- 

 goid; qu, quadrate; ta, tabulare; on, otic notch; st, supratemporal (?); sq, squamosal. 



B, dorsal view; lettering as in A. 



The skull described above is No. 670 of the University of Chicago collections. 

 The vertebra is No. 669. The writer is indebted to Dr. S. W. Williston for the 

 privilege of studying this material and other specimens that are used for compari- 

 son and also for his kind suggestions and corrections in the preparation of this 

 chapter. 



