58 Messrs. Hancock & Atthey on a new Labyrinthodont 
fs 
lines, the two inner cornua project ; they are a quarter of an inch 
long, are conical and irregularly three- or four-sided, with the 
surface roughened with ornamentation like that of the skull, 
In front the occipitals are divided from the parietals by a 
double, raised, transverse line. The latter are as wide as the 
occipitals, and have their lateral boundaries marked in the 
same manner by raised lines, which are in continuation of 
those of the occipitals, but are not so much elevated. ‘These 
parietal lines slightly incline towards each other as they ad- 
vance forward, which they do for about half an inch; they 
then diverge a little, and are lost in front in a circular groove 
which reaches four tenths of an inch further forward. The 
anterior boundary of the parietals appears to be at the point 
where the lateral lines are most approximate; and in front of 
this the circular groove may perhaps circumscribe the frontals 
and nasals. 
On the longitudinal middle line, a little in advance of the 
posterior margin of the parietals, there is a circular foramen a 
tenth of an inch wide, thus proving that we are correct in de- 
nominating this elongated area the parietals: consequently 
the area behind must be that of the occipitals. But we must 
remark that the forward position of the parietals and the great 
extent of the occipitals are uncommon features in the Laby- 
rinthodonts, and seem to indicate an approximation to the 
Batrachian form of structure—though, as we shall afterwards 
endeayour to show, our new genus is more closely related to 
the recent genera Siren, Proteus, and Axolotl. 
It is difficult to say of what bones the lateral expansions 
are composed; they remind us much of similar expansions 
. The posterior margin of each lateral expansion extends in a 
straight line outwards and backwards from the base of the 
