1 64 MAURICE G. MEHL 



8. Mesorhinus Jaekel 



Mesorhinus fraasi Jaekel 



9 . Parasuchus Lydekker 



P. hislopi Lydekker 

 Doubtful genera and species: 



Rylea platyodon E. von Huene gen., Riley and Stutchbury sp. 



These few imperfect remains, consisting of incomplete limb 

 bones, teeth, caudal vertebrae, etc., are in all probability phy to- 

 saurian, but the material seems to be too meager to receive a 

 generic or even a specific name. 



Episcoposaurus E. D. Cope 

 E. horridus E. D. Cope 

 E. haplocerus E. D. Cope 



Little is known of either of these two forms and their reference 

 to the phytosaurs is not entirely warranted. 



The genus Palaeochtinus^ Cope, under which were described 

 P. appalachianus, P. orthodon,^ and P. dumblainus,^ was based on 

 a few teeth that Cope took to be those of a large dinosaur. These 

 resemble closely some of the teeth figured with Angistorhinus and 

 other phytosaurs and may well be phytosaurian remains. 

 Incertae sedis: 



Steganolepis robertsoni T. H. Huxley 



While the fragmentary remains that represent this form may 

 indicate their phytosaurian affinity, the relationship is not at all 

 clear. In view of our meager knowledge of this form and also 

 Mesorhinus, it hardly seems advisable at this time to remove the 

 latter form from the Phytosauridae and place it with Steganolepis 

 in the family Steganolepidae as F. von Huene has suggested."* 

 Probably undue stress has been placed on the presence of a parietal 

 foramen in Mesorhinus. Only a single incomplete and poorly pre- 

 served skull has as yet been found. This fact being considered, it 

 would seem that the presence of the parietal foramen is in nowise 

 definitely established. 



' Proceedings Amer. Philos. Soc, 1877, p. 182. 



^ "A Preliminary Report of the Vertebrate Paleontology of the Llano Estacado," 

 Geol. Survey of Texas, Fourth Ann. Rept., 1892, p. 15, PI. 2, Fig. i. 



i Ibid., p. 16, PL 2, Figs. 4-6. 't Op. cit., p. 50. 



