530 MOODIE. [Vor. XIX. 
not be of importance were there remains of other species of 
labyrinthodonts known from these deposits. There are lit- 
erally millions of fragments of labyrinthodont skeletons 
scattered along the exposures of the Popo Agie beds of 
Wyoming for a distance of more than thirty miles, but all’ 
of the fragments are of the same character and these two 
skulls represent the sum total of skulls, save fragments, from 
the Triassic deposits of the West. It is, I believe, therefore 
safe to assume that A. brachygnatha is a youthful form of A. 
browni, and that the lateral line canals really do become more 
deeply incised with age, lose the pits from the bottoms of the 
canals and become more clearly marked and more closely 
connected. 
The temporal canal in Anaschisma browni (Fig. 14) is 
represented by broken furrows. The portions preserved 
exhibit the usual downward tendency of the canal to unite 
with the infraorbital on the postorbital element. In its course 
forward from the epiotic the temporal canal cuts the squa- 
mosal;-a matter of considerable importance to be referred to 
later on. The supraorbital canal has an unusually deviating 
course in Anaschisma, but aside from the minor twists and 
curves it does not differ essentially from the same canal in 
other forms. It ends abruptly at the anterior end of the muz- 
zle. In its course it gives off the vestige of an antorbital com- 
missure which tends to join a vestige from the infraorbital 
canal. The jugal canal begins broadly at the very posterior 
edge of the skull as though it were continued, as it 
undoubtedly was, to the body of the animal. In its course 
forward it joins the infraorbital canal on the jugal. The 
course of the infraorbital is not unusual in any respect. There 
is no anterior commissure on the skull nor is the occipital 
cross-commissure developed in either of the specimens. There 
are distinct indications of the operculo-mandibular canal on 
the mandibles of Anaschisma. Each skull has a mandibular 
ramus preserved and the canals are identical on the two rami. 
The canal enters the mandible on the surangular and passes 
forward around the mandible as described for Diplocaulus. 
OO 
