ESPECIALLY MYCTOPHOIDS 155 
passes postero-ventrally to the rear edge of the bone where it continues ventrally. 
At the point of contact with the posterior edge this lateral crest is produced into a 
small spine (Text-fig. 70). This spine lies lateral to the opercular process (approxi- 
mately one-third of the way down the rear edge of the bone). The hyomandibular 
tapers ventrally and the symplectic is visible within an indentation of the upper 
edge of the quadrate. The quadrate is stout with a prominent transversely arranged 
condyle. The rear edge is thickened where it contacts the leading edge of the pre- 
operculum. The palato-pterygoid bones were not shown well in any of the specimens 
examined, but they do not appear to differ to any extent from those of Aulopus 
described in the next section (Text-fig. 89, p. 211). 
ea Bf ale nan 
st fr 
scl 
YA SYS 
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smx2 
sym q é 2mm 
a 
Fic. 70. Sardinioides minimus (Agassiz). Restoration of the skull in lateral view. 
Dermal upper jaw. The dermal upper jaw is shown in lateral view in Text-figure 
70. The premaxilla completely excludes the maxilla from the oral border of the 
jaw. Anteriorly there is a prominent, broad ascending process but posteriorly the 
bone becomes long and very thin. The ascending process articulates with the 
anterior mesethmoid region. An articular process from the lateral region of the 
ascending process abuts against a facet on the anterior edge of the maxillary head. 
The alveolar arm of the premaxilla is closely applied to the ventral edge of the 
maxilla for its entire length. 
The maxilla is larger and stouter than the premaxilla and has a medially inclined 
head. The antero-dorsal part has a depression into which the maxillary process 
of the palatine fits. This depression is bounded posteriorly by a flange. The 
