592 E. B. BRANSON 



The specimens that have been referred to this genus are the 

 back part of a skull from Chester County, Pennsylvania, one ramus 

 of a mandible, some teeth, an interclavicle, and some other fragments- 

 from York County, Pennsylvania, and some fragments from the 

 Docum Beds of northwestern Texas. It is not at all certain that 

 the specimens from York and Chester Counties belong to the same 

 genus, and it seems very probable that the Texas specimens are 

 generically distinct from those of Pennsylvania. 



The data seem too meager to warrant a discussion of the relation- 

 ship of this genus, but a few general conclusions may not be inappro- 

 priate. From the length of the postorbital it is evident that the part 

 of the skull behind the orbits was shorter than in Anaschisma, but 

 longer than in Mastodonsaurus. The breadth of the parietals 

 posteriorly is about the same as in Anaschisma, but anteriorly they 

 are much broader than in that genus. Since the mucous canals 

 are only 3 cm apart between the orbits, it is probable that the orbits 

 were approximated, though not so much so as in Mastodonsaurus, 

 The interclavicle is proportionally narrower than in Metoposaurus. 

 So far, then, as the characters that are known indicate, Eupelor is- 

 intermediate between Mastodonsaurus and Anaschisma. 



In 1868 Cope referred 1 some teeth from Chester County, Pennsyl- 

 vania, to this genus, but a year later he concluded 2 that they belonged 

 to thecodont reptiles. Later he described teeth that he found in 

 situ, in a mandible, 3 and suggested that those which he originally 

 described were rightly determined. This is hardly probable, since 

 these teeth are rarely found fossilized, except as stumps in the jaws,, 

 and his so-called thecodont reptiles teeth are not at all rare. 



The known remains are all referred to one species, Eupelor durus 

 Cope. No figures of the specimens have ever been published. 



Pariostegus Cope 



Pariostegus Cope, 1868 ("Synopsis of the Extinct Batrachia of North America,"' 

 Proceedings of the Academy of Natural Sciences of Philadelphia, p. 221). 



Pariostegus Cope, 1869 ("The Extinct Batrachia, Reptilia, and Aves of North 

 America," Transactions of the American Philosophical Society, Vol. XI V, 

 p. 10). 



1 Loc. tit., p. 221. 2 Loc. tit., p. 25. 



3 Proceedings of the American Philosophical Society, 1887, p. 209. 



