ESPECIALLY MYCTOPHOIDS Te 
the preopercular sensory canal entered the pterotic to contact the otic branch of the 
infraorbital canal. The presence of a complete supratemporal commissure is 
indicated by the continuous transverse groove on the parietals and epiotics and the 
supraoccipital. This groove ends laterally above the posterior end of the post- 
temporal fossa. Possibly the sensory canal passed laterally in a superficial position 
and joined with the otic branch of the infraorbital canal immediately posterior to 
the pterotic crest. 
The mesethmoid is prominent and well ossified, bearing a pair of lateral wings 
which are fused to the dorsal surface of the vomer. The composite wings thus 
formed produce an elongate articulatory region which fits into a correspondingly 
elongated facet on the internal face of the anterior palatine region. The anterior 
edge of the mesethmoid is straight and transversely arranged. The pedicels of the 
premaxillae rested upon this edge. 
The lateral ethmoids are well ossified both posteriorly and ventrally. The ventral 
region is pitted and excavated and was in life probably capped by cartilage. This 
region of the lateral ethmoid supported the posterior end of the palatine. Dorsally 
the lateral ethmoids are splayed apart and attach to the underside of the frontals. 
The vomer is closely adherent to the ventral surface of the mesethmoid, although 
its actual outline is difficult to determine. Teeth are definitely not present on the 
vomer. 
The parasphenoid is continuous for practically the entire length of the neuro- 
cranium. The ascending processes of the parasphenoid are inclined at go° to the rest 
of the bone. Throughout the orbital region the parasphenoid is of uniform shape 
Fic. 34. Enchodus lewesiensis (Mantell). Neurocranium in lateral view. 
