268 ON DASYCEPS BUCKLANDI 
approach Dasyceps in the posterior situation and small size of their 
orbits, but the latter differs from these and from all other Labyrinth- 
odonts with which I am acquainted, in the backward position of the 
external nostrils, in the existence of a “ facial fontanelle,”1 and in the 
magnitude and backward extension of the anterior palatine foramen. 
Add to these the characters of the teeth ; the great size and posterior 
projection of the processes #, and the peculiarly rugose and almost 
spinulose sculpture of the surface of the cranial bones, and the generic 
distinction of Dasyceps from all other Labyrinthodonts appears to be 
fully justified. 
The only other known Permian Labyrinthodont is the Zygo- 
saurus luctus from the Cupriferous Zechstein of Russia, described by 
Eichwald in the “ Bulletin de la Société Impériale des Naturalistes 
de Moscou,” for 1848. It differs very widely from Dasyceps. 
! This fontanelle would seem to correspond with the interspacc left between the ascending 
processes of the premaxillary bones in the common frog. 
