26 



AMERICAN PERMIAN VERTEBRATES 



anterior end of the skull. The orbits -are relatively small and 

 situated far back, the distance between orbits and nares being 

 greater than the extent of the skull posteriorly. They are oval 

 in outline, somewhat narrowed in the specimen, their planes nearly 



Fig. s.—Limnoscelis pahtdis Will. Skull from above, two-fifths natural size. 

 pm, premaxilla; n, nasal; /, lachrymal; /, frontal; pf, prefrontal; pof, postfrontal; 

 po, postorbital; pa, parietal; do, dermoccipital; /, tabulare. 



parallel to each other and nearly vertical, the posterior part turned 

 a little outward. 



The premaxillae are very massive bones, strongly protuberant 

 in front. The suture uniting them with the nasal is strongly 

 digitative, beginning at the front end of the nares. Each pre- 

 maxilla has three large, conical, and recurved teeth. In the specimen 



