ESPECIALLY MYCTOPHOIDS 163 
to the medial face of the quadrate and inclines forwards at an angle to the hyo- 
mandibular. The quadrate is large and triangular with the anterior edge con- 
siderably longer than the posterior. The condyle is thickened and mesially con- 
stricted. The posterior edge of the quadrate is thicker where the preoperculum 
rests against it. The postero-dorsal edge of the quadrate is deeply excavated at 
the upper limit of the symplectic groove. The quadrate dorsally contacts the lower 
edge of the metapterygoid, and anteriorly the ectopterygoid. The remainder of the 
palate is not preserved, except anteriorly where the maxillary process of the palatine 
is visible. This process is in the form of a funnel-shaped protuberance from the 
dorso-lateral part of the palatine. 
Dermal upper jaw. The dermal upper jaw is shown in lateral view in Text- 
figures 73 and 74. It is long and extensively toothed. The premaxilla has a short, 
broad, ill-defined ascending process. Laterally the ascending process has a small 
articulatory process for a facet on the leading edge of the maxillary head. The 
posterior process of the premaxilla is prominent with a broad oral border covered 
by small recurved teeth. The premaxilla forms the anterior third of the oral border 
of the upper jaw. The external face of the premaxilla is unornamented. 
The maxilla is also unornamented. Anteriorly the maxilla curves medially and 
has a large rounded dorso-medial depression, bounded posteriorly by a prominent 
flange. The maxillary process of the palatine is contained within this facet. 
Antero-medial to the facet the head of the maxilla is rounded. The maxillary head 
appears to be associated with the dorsal surface of the vomer and the undersurface 
of the mesethmoid. The anterior face of the maxilla, in front of the palatine facet, 
is excavated for the reception of the articular process of the premaxilla. The maxilla 
extends posteriorly above the premaxilla as a stout bar of bone. Behind the pre- 
maxilla the maxilla deepens, and the tooth-bearing margin is thinner and flatter 
although the stout part of the maxilla is continued back for some way above the 
dentigerous region. The toothed margin is a deep, curved flange ; the teeth are 
numerous anteriorly, but reduced in number towards the posterior end. 
Two large supramaxillae are attached to the dorsal edge of the maxilla along 
most of its length. The anterior supramaxilla is a roughly oval slip of bone pro- 
longed somewhat anteriorly. The posterior supramaxilla is larger and has a dorsal 
process extending anteriorly along the upper edge of the anterior supramaxilla. A 
ridge on this antero-dorsal process continues back on to the lateral face of the 
supramaxilla. Both bones are unornamented. 
Mandible. The mandible is shown in lateral view in Text-figures 73 and 74. It 
is quite long and deep, with a pronounced coronoid process. The symphysis is 
blunt and not deepened, although there seems to be a slight ventral prolongation. 
The oral border of the dentary bears a group of small, clustered, recurved teeth. 
The mandibular sensory canal, in the dentary, ran within the bone, opening to 
the exterior through three or four prominent pores. The tube opens into a groove 
towards the posterior end of the dentary. The articular forms the posterior part of 
the mandible and the articular facet is shallow and transversely orientated. A small 
