STEWART: NOTES ON SAURODON AND ALLIED SPECIES. 185 
minute strie radiating upward from the condyle. The sympletic 
isa long slender element. The upper end presents an articular 
surface, similar to that found on the superior border of the quadrate. 
The whole of the palatine is preserved. It is an irregular-shaped 
bone, presenting a ragged sutural surface above and below for the 
pterygoid and mesopterygoid. The bone is especially remarkable 
for the great depth of the maleolar portion, being nearly half as 
deep as the corresponding part in X7phactinus. The superior artic- 
ular surface is small and oval in outline, while the lower is larger 
and more elliptical. The depth of the maleolar portion is 20 mm. 
The hyomandibular is very similar to that found in /chthyodectes. 
The superior condyle is elongated and depressed in the central 
portion. In the skull of S. ¢xtermedius, figured by Newton*, this 
condyle is shown to be regularly rounded from before backward. 
As all the figures and descriptions of the Saurodont hyomandibular 
show the depression described above, | am inclined to think that 
this portion may have been distorted in the specimen figured by 
Mr, Newton. Extending downward from the anterior and poster- 
ior angles, there are two slight ridges. which converge toward the 
center and form a much larger one which extends downward to 
nearly the lower extremity of the bone. It forms the outer 
border of the groove for the preoperculum. There is also another 
ridge on the internal side, just in front of the condyle for the oper- 
culum, but it is not so prominent as the one just mentioned. The 
condyle for the operculum is elongated as in /chthyodectes. 
The lower extremity of the bone presents an articular surface 
similar in size and character to that found at the upper end of the 
sympletic. 1! think it is very likely that these two bones articulate 
at this point. 
A small portion of a scapula is preserved. It shows only two 
distinct articular condyles, one large and one small, instead of 
three as in Azphactinus. Portions of several spines are preserved, 
of which one complete and a portion of another are shown in the 
figure and need no further consideration. 
The first anterior vertebra has the posterior end deeply concave, 
but the anterior end is not so deep, and has a slight protuberance 
projecting forward above. On the superior surface there are two 
deep, rounded pits for the neurapophyses; aside from this there are 
no other grooves displayed upon the centra. 
A small toothed element was found on the internal side of one of 
the maxillz at about the point where the pterygoid should he, but 
STC ple XXXIV. 
