168 



LABYKINTHODONTIA . 



rently a vomer) exhibiting denticules and two tusks. 

 Original from Nyf an ; figured by Fritsch, op. cit. pi. lxii. 

 figs. 3, 4. Purchased, 1888. 



Fig. 40. 



Nyrania trachystoma. — Frontal aspect of the cranium ; from the Gaskohle of 

 Bohemia. ^. im, premaxilla ; m, maxilla ; JV, nasal ; L, lachrymal ; /, 

 frontal ; Pf, prefrontal ; Ptf, postfrontal ; Pto, postorbital ; Pa, parietal ; 

 OS, supraoccipital ; sq, squamosal ; Squ, supratemporal ; ep, epiotic ; QJ, 

 quadratojugal ; J, jugal. (After Fritsch.) 



Genus ICHTHYERPETUM, Huxley 1 . 



Syn. Erpetocephalus, Huxley 2 . 



Apparently very closely allied to Nyrania, but the epiotic cornua 

 less produced laterally, and the orbits relatively larger. Palate 

 unknown. 



Whether these slight differences are sufficient to justify the 

 generic distinctness of Nyrania may be doubtful. The present 

 genus was founded upon the evidence of the vertebral column, while 

 Eupetocejphalus was based upon that of the skull, but it was sug- 

 gested in the original description that the two might prove to be 

 identical. 



1 Trans. Boy. Irish Academy, vol. xxiv. p. 367 (1867). 

 Ichthyerpeton. 



Amended from 



Rid. p. 368. 



