ESPECIALLY MYCTOPHOIDS 87 
ventro-laterally. The parasphenoid is visible beneath the orbit as an almost 
straight rod of bone with no lateral expansions. From the underside of the frontals, 
above the orbit, the lateral ethmoid is produced downwards and connects with the 
hind end of the palatine. The frontals bear an ornamentation of prominent ridges, 
the major ridges running longitudinally, especially above the orbit, and following the 
course of the supraorbital sensory canal. The mid-region of the frontals is smooth 
and unornamented ; some small ridges appear above the sphenotic and pass 
laterally to the upper margin of the orbit. 
Infraorbital bones. The infraorbitals are shown in the lateral view of the skull, 
Text-figure 39. There are four narrow elongate infraorbitals and an elongated 
anterior lachrymal. The lachrymal is the largest bone in the series and is longer 
than deep. The antero-dorsal region of the lachrymal is produced dorsally, forming 
the anterior limit of the orbit. This dorsal projection articulates with the lateral 
ethmoid. Anteriorly and ventrally the lachrymal is expanded and overlaps the 
upper lateral region of the premaxilla. The ventral border of the lachrymal is 
slightly irregular in outline whilst the dorsal border is thickened and uniform. The 
infraorbital sensory canal was housed within a tube passing through each of the five 
bones which is incomplete in several places. On the lachrymal the sensory canal 
opened on to the surface of the bone in two places, anteriorly and antero-ventrally. 
The latter opening is in line with a groove on the lateral face of the premaxilla, 
which may have contained an anterior extension of the sensory canal. The lachry- 
mal is thickened along the course of the sensory canal and shows some evidence 
Fic. 39. Enchodus marchesettu (Kramberger). Restoration of the skull in lateral view. 
