Cope.] 1-^^ [May 15, 



is nearer the anterior border of the orbit than to the nostril. In front of 

 it are three teetli which are preceded by an interval. There are three and 

 perhaps four incisors on each side, of which the external two are small 

 and the internal two very large, the inner the largest. The mandibular 

 teeth increase regulurl}- in length anteriorly. The nostrils are lateral 

 and absolutely terminal. The premaxillary bones are recurved so that 

 the alveolar edge is in vertical line with the posterior border of the nos- 

 tril. Thus this recurvature exceeds that seen in any other species of the 

 genus, and the symphysis mandibuli is correspondingly posterior. The 

 orbits are larger than in any other species, exceeding the interorbital 

 width considerably, and equaling the length of the muzzle from the orbit 

 to the middle of the nostril. The muzzle is wide above in proportion 

 to its length. It is probable that the width of the skull behind does 

 not exceed the length from the posterior border to the front of the orbit, 

 though this measurement is uncertain owing to the mutilated condition 

 of the right side. 



The surface is sculptured with shallow pits separated by rather thick 

 ridges. The nasal bones send back a short angle of the external margin 

 to meet the inferior prefrontal siiture, about halfway between the orbit 

 and nostril. 



Measurements. mm. 



Length of skull to end of os quadratum 54 



" " posterior to orbit 18 



orbit , 15 



Length from orbit to nostril 12 



Width of muzzle at middle 15 



" interorbital space 10 



' ' internareal " 8 



Length of recurved part of premaxillary 7 



' ' premaxillary I, 1 5 



' ' longest maxillary tooth 4 



Depth of mandible at middle of orbit G 



From the Permian formation of Texas. 



? PARIASAURID.E. 



Labidosaurus hamatus Cope, gen. nov. Parioticlius hamatus Cope, 

 ProG. Amer. Philos. Soc, 1895, p. 448, PI. viii. Figs. 1 and 2. 



Char. gen. — One series of pleurodont maxillary teeth slightly unequal 

 in size. Internal incisor much enlarged, conic, acute, and directed back- 

 wards. No teeth on the maxillopalatines ; teeth on the palatines small, 

 subcouic, in one row. Nostrils lateral. 



Better specimens of the above species show that it has but one row of 

 maxillary teeth, which are pleurodont, so that it is clearly a meml)er of 

 a genus distinct from Pariotichus. If the character I have assiii'ned as 



