ESPECIALLY MYCTOPHOIDS 161 
hyomandibular facet is divided into two regions, an anterior cup-shaped concavity 
in the sphenotic and prootic, and a posterior elongated groove on the ventro-lateral 
surface of the pterotic. 
The large parietals meet in the mid-line. The parietal contacts the frontal 
anteriorly and the pterotic laterally and enters into the composition of the roof of 
the post-temporal fossa. The remainder of the neurocranium is poorly shown. 
The epiotic appears to project posteriorly and the dorsal limb of the post-temporal 
bone is associated with its dorsal surface. In the region of the occipital condyle the 
exoccipital and basioccipital are thickened and meet in a prominent suture. Below 
the condylar region the parasphenoid is curved upwards slightly. In the base of 
the orbit the parasphenoid is expanded laterally into ventrally inclined flanges. 
The mesethmoid is prominent but appears to have been only superficially ossified. 
It bears a pair of lateral wings inclined antero-ventrally, which are underlain by 
lateral extensions of the vomer. There is no connection laterally between the two 
bones. The palatine, antero-medially, is closely associated with the lateral edge of 
the vomer and also possibly the mesethmoid. The lateral ethmoids are not well 
ossified and ventrally contact the palatines. The lachrymal lies on the ventro- 
lateral region of the lateral ethmoid. 
The articular head of the maxilla appears to have rested on the dorsal surface of 
the lateral part of the vomer and would thus also have contacted the ventral surface 
of the lateral wing of the mesethmoid. The posterior process or shaft of the vomer 
hm fr le mes 
epo : na as.p.pm 
mMx.p.p 
TERE 
dS 
ae 
smx2 
Fic. 73. Pattersonichthys delicatus gen. et sp.nov. Restoration of the skull of the holotype 
(B.M.N.H. number P.9976) in lateral view. 
