ESPECIALLY MYCTOPHOIDS EK, 
continuation of the slip of bone forming the lateral wall of the pars jugularis. The 
anterior region of the hyomandibular facet is immediately behind the strut on the 
sphenotic. 
The epiotic forms much of the posterior face of the neurocranium, and extends 
on to the extreme posterior end of the skull-roof. Laterally the epiotic enters 
into the composition of the post-temporal fossa forming the medial parts of the 
posterior end, i.e. floor, wall and roof. In the floor of the post-temporal fossa it 
contacts the pterotic and on the posterior face of the skull, below the opening of the 
fossa, it meets the intercalar. 
The intercalar is a moderately large bone forming part of the cranial wall itself. 
It is bent mesially into a right angle and forms the dorso-lateral continuation of the 
strut produced on the exoccipital laterally. On the posterior face of the skull it 
contacts the exoccipital, the epiotic, and dorso-laterally, below the post-temporal 
fossa, it joins the pterotic. On the lateral face of the neurocranium it contacts the 
exoccipital and the pterotic below the hind end of the hyomandibular facet. A 
posterior projecting knob of bone is present on the intercalar representing the point 
at which the ventral limb of the post-temporal bone attached to the skull. 
The pleurosphenoids lie in the dorsal region of the posterior face of the orbit, and 
contact the frontals above, the sphenotics laterally and the prootics ventrally. The 
superficial ophthalmic nerves crossed the face of the pleurosphenoid in a slight 
groove near the medial edge of the bone. 
Infraorbital bones. The infraorbital bones are shown in lateral view in Text-figure 
54 and differ in no way from those of the type species, Eurypholis boissiert (p. 102). 
Hyopalatine bones. The hyopalatine bones are shown in medial view in Text- 
figure 53. The hyomandibular is broad, curved and inclined forwards ventrally. 
The head is elongated antero-posteriorly. The opercular process on the hind edge of 
the bone is prominent and occurs just within the lower half of the bone. A promi- 
nent crest on the lateral face arises near the anterior region of the head and curves 
postero-ventrally towards the posterior edge, terminating near the ventral extremity. 
The hyomandibular tapers ventrally. Anteriorly the hyomandibular is thin, 
expanded and overlain laterally by the metapterygoid. The hyomandibular branch 
of the facial nerve entered through a large antero-dorsal foramen on the medial 
face of the bone. Within the bone the nerve divided into the opercular branch, 
which emerged through a foramen immediately above the opercular process, and 
the mandibular branch which passed through a foramen situated below the opercular 
process. The mandibular nerve continued ventrally in a shallow groove on the 
antero-medial edge of the preoperculum on to the mandible ventrally, below the 
articular facet. 
The symplectic is short, stout and inclined forwards ventrally. Its ventral region 
lies in a wide groove on the postero-medial part of the quadrate and dorsally it ends 
close to the ventral extremity of the hyomandibular, to which, in life, it was 
connected by cartilage. 
The quadrate is large and triangular, with a prominent transversely arranged 
condyle. The bone thins dorsally, but its anterior and posterior regions are thick 
