154 UPPER CRETACEOUS FELEOSTS 
Ho.otyrPe. At one time in the Amic collection, Paris, but present whereabouts 
unknown. It was a flattened fish from the Middle Cenomanian of Hakel, Lebanon. 
MATERIAL. Nine specimens in the B.M.N.H., 6 from the Middle Cenomanian of 
Hakel and 3 from the Middle Cenomanian of Hajula. All 9 specimens were prepared 
by the transfer method in acetic acid. 
DESCRIPTION. Neurocranium. The neurocranium is shallow and reaches its 
maximum depth below the hind end of the orbit. The parasphenoid is long and 
straight. The frontals form the major part of the skull-roof and extend back to 
cover most of the cranial cavity. They meet in the mid-line in a sinuous suture and 
are widest at the hind end of the orbit where they extend above the dorsal surface of 
the sphenotic. In this region the frontal is indented. Within this indentation the 
dorsal surface of the sphenotic contacts the pterotic. The frontal meets the parietal 
and pterotic posteriorly and the sphenotic and pterotic laterally. The surface of all 
the bones is unornamented. The supraorbital sensory canal ran within the frontal 
above the orbit. Anteriorly the frontal tapers from in front of the orbit to insert on 
the dorsal surface of the broad mesethmoid region. 
The parietals meet in the mid-line of the skull-roof and are rectangular in shape. 
They join the frontals anteriorly, the pterotics laterally in the roof of the post- 
temporal fossa and the epiotics posteriorly. The supratemporal lies on the posterior 
surface of the parietal. . 
The pterotic forms the postero-lateral region of the skull-roof, meeting the frontal 
and parietal medially in the roof of the post-temporal fossa, and the sphenotic 
anteriorly. The lateral surface of the pterotic is deeply excavated to form the 
dilatator fossa and the pterotic contacts the sphenotic in the anterior region of it. 
The hyomandibular facet is composed of sphenotic and pterotic with possibly an 
anterior contribution from the prootic. The otic branch of the infraorbital sensory 
canal passed within the pterotic above the dilatator fossa. The main infraorbital 
sensory canal from the last infraorbital bone connected with the otic branch on the 
dorsal sphenotic region, and then passed into the frontal. 
In all of the specimens in which it is preserved, the last infraorbital remains closely 
attached to the dorsal sphenotic region (as it is in Aulopus, p. 208). Anteriorly the 
neurocranium is indistinct. The mesethmoid is a broad bone bifurcated anteriorly, 
producing two antero-lateral projections which are thickened and incline ventrally. 
The enlarged head of each maxilla fits beneath these projections, being retained in 
position by the vomer below. Ventro-lateral mesethmoid wings are also present 
associated with the palatine. A posterior process of the vomer passes back beneath 
the anterior end of the parasphenoid in the lateral ethmoid region. The lateral 
ethmoids attach to the parasphenoid and palatine ventrally. 
A partially ossified interorbital septum may possibly represent an orbitosphenoid. 
Traces of a basisphenoid pedicel are also evident in the rear of the orbit. 
Lying against the edge of the lateral ethmoid is a fragmentary bone which is 
probably an antorbital. 
Hyopalatine bones. The hyomandibular is upright and narrow with a forwardly 
inclined, single and elongate head. A lateral crest on the anterior region of the head 
