3° 



AMERICAN PERMIAN VERTEBRATES 



Pareiasaurus, a strong indication of relationship. On either 

 side of the basioccipital I think I have interpreted the bones of the 

 posterior palatal and occipital regions, but I prefer to wait before 

 publishing my conclusions, in the hope of getting additional material 

 of this form the coming season. 



The mandibles of Limnoscelis are very powerful, indicative of 

 the carnivorous habits of the animal in life. They lie in perfect 

 relation to each other, save that they are a little skewed to the 

 right. They are broadly separated behind, with a long convexity 

 on the sides, and again expanded at the front end. The teeth are 

 only partly visible from without; the one or more large ones in 

 front opposing the premaxillary teeth is wholly hidden; nor can 



Fig. 5. — Limnoscelis paludis. Skull, from side, two-fifths natural size, pm, 

 premaxilla; n, nasal; /, lachrymal; m, maxilla; />/, prefrontal; pof, postfrontal; 

 po, postorbital; j, jugal; sq, squamosal; qj, quadratojugal; q, quadrate; d, dentary; 

 sur, surangular; ang, angular. 



the number be made out with certainty. The postarticular 

 process is small, not extending back of the quadrate, or if so, 

 for a few millimeters only. Externally the suture separating 

 the angular from the surangular passes forward near the upper part 

 of the bone, and backward nearly to the extremity. On the inner 

 side of the mandible the structure is peculiar. A broad flange is 

 directed inward, nearly vertically, opposite the middle of the 

 articular surface, concave in front. The suture separating the 

 prearticular from the articular is very conspicuous, passing back 

 over the flange. In front the prearticular passes far forward, 

 between the upper opening to the cavity of mandible and the 



