ESPECIALLY MYCTOPHOIDS 27 
which decrease in size posteriorly. Each tooth is laterally compressed and acutely 
pointed with longitudinal striations more noticeable on the unexpanded basal 
regions (see also Woodward 1912 : 41, fig. 9, and Kruizinga 1924). 
The palatine is prominent and overlaps the anterior end of the ectopterygoid both 
laterally and medially. Both medial and lateral faces of the palatine are flattened 
and the ventral face of the bone is concave. The ventral concavity supports two 
prominent teeth, the large one arising at the extreme posterior end of the palatine. 
The anterior tooth is smaller and much nearer the anterior extremity. The teeth are 
identical in shape and form to those on the ectopterygoid with which they form a 
continuous row. The postero-dorsal edge of the palatine is excavated for the re- 
ception of the lateral ethmoid. The medial edge of the palatine articulates with the 
lateral edges of both the mesethmoid and the vomer. 
The endopterygoid is thin and inclined dorso-medially. Its ventral surface is 
convex and bears a large, oval patch of minute teeth. 
Dermal upper jaw. The dermal upper jaw is shown in lateral view in the recon- 
structed skull, Text-figure 11. This is very incompletely preserved. The pre- 
maxilla is a small, thin lamina of bone lying alongside the anterior end of the palatine. 
ptf hm.h 
ors fr 
mpt 
op 
sop 
art 
ae PoP ang q ‘ 50mm 
Fic. 11. Apateodus striatus Woodward. Restoration of the skull in lateral view. 
The upper edge of the premaxilla is rounded but its toothed oral margin is straight. 
The teeth are minute and the premaxilla extends from the tip of the snout to just 
behind the level of the lateral ethmoid, thus occupying approximately one-third of 
the total gape. The maxilla is long, thin and narrow and does not appear to have 
