ESPECIALLY MYCTOPHOIDS 213 
teeth. Anteriorly the teeth are arranged into three distinct rows, a minute row of 
marginal teeth, a median row of slightly larger teeth and an internal row of much 
larger teeth. All of the teeth are similar, being long, thin, needle-like and slightly 
recurved. Posteriorly the teeth decrease in size and are confined to two rather than 
three rows. 
The anterior part of the maxilla, like that of the premaxilla, is inclined medially. 
The dorsal surface of the anterior part of the bone is excavated as a shallow depres- 
sion into which the maxillary process of the palatine fits. The actual head of the 
maxilla is small and rounded, sandwiched between the dorsal surface of the vomer 
and the ventral surface of the antero-lateral mesethmoid projection. The articular 
process of the premaxilla fits against a shallow concave facet on the anterior edge of 
the maxilla just lateral to the maxillary head. The maxilla is an elongate shaft of 
bone, stout anteriorly but becoming flattened and deepened posteriorly. The lateral 
face is smooth and dorsally supports two supramaxillae. Both supramaxillae are 
small and elongate, the anterior one being the smaller. 
epo pa d.f 
st fr 
sca 
AR 
v.pcl cor 
sop sym smx2 
lop pop ang tS 
Fic. 90. Aulopus filamentosus. Skull in lateral view. 
Mandible. The mandible is shown in medial and lateral views in Text-figures 89 
and go. It is long and deepened posteriorly. The dentary forms the greater part 
of the ventral border, the whole of the oral border and a considerable proportion of 
the lateral face. In lateral view the dentary is V-shaped with the indentation 
occluded by the anterior part of the articular. The symphysis is constricted and 
blunt and each mandible has an inflected ventral edge. Ventro-laterally a tube 
within the bone opens to the exterior by a row of small pores. The mandibular 
sensory canal runs within the tube. Posteriorly the ventral limb of the dentary 
