204 PROF. D. M. S. WATSON AND MR. E. L. GILL ON THE 
•centre of the bone. This ornament much resembles that oE Stegocephalian 
■skulls, and is unique amongst Dipnoi. 
The palate is beautifully shown in the skeleton. The parasphenoid has a 
H'idc but incompletely preserved stem, which expands into an elongated but 
relatively very narrow lozenge, with the margin of which the pterygoids 
articulate. 
The pterjrgoids cover a very large area, meeting one another in a long 
symphysis in front of the parasphenoid and passing out to the lateral margins, 
which are quite straight and make an acute angle with one another. The 
hinder end of the pterygoid is widened, is attached to the parasphenoid by a 
Tery long suture, and produced into a rounded corner in the quadrate region. 
The dentition of each pterygoid consists of a marginal row of large, 
■compressed, conical teeth and of a very large number of small, almost 
hemispherical denticles covering a narrow area within the margin. These 
■denticles are rather regularlj'' arranged in a series of straight lines, running 
parallel to one another from caudal and lateral to cranial and mesial ; 
"that is, they do not agree with the normal direction of teeth-rows seen in the 
pterygoids of Uipterus and Sagenodus. 
The two prevomers of the skeleton are preserved ; each consists of a bone 
with a cylindrical notch on the dorsal surface, which supports a row of four 
denticles exactly similar to those of the " splenial." 
There are in the skeleton three small bones, each bearing small, elongated 
ieeth ; two of them lie in close association with a prevomer : it is certain 
that they are not lower jaw elements, and the conclusion seems irresistible 
that they are premaxillse and maxillas corresponding to those found by 
Watson and Day in Plianeropleuron. 
The two rami of the lower jaw are separable at the sjanpliysis, and each 
-consists of at least three, almost certainly of four, bones. 
The angular is a large bone exactly like that of Ctenodus in shape and 
■bearing a similar row of sensory pits. It articulates by a fine suture 
■'with a splenial (dentary of Ceratodus), which presumably extended to the 
symphysis. 
There is a rather large dentary, whose distinctness from the splenial 
■cannot be proved, which beai-s an irregular strip of crowded small denticles. 
The prearticular (splenial of Ceratvdus) extends from the articular region, 
toward and probably up to the symphysis ; it bears only a simple series of 
teeth on its upper edge, which bite outside and are exactly similar to the 
■marginal teeth of the pterygoid. 
The opercular apparatus seems to consist only of a large oval operculum, 
-agreeing closelj' in shape with that of Sagenodus. 
There are a pair of badly-preserved ceratohyals, agreeing closely with 
■those of Ceratoduf. 
