160 UPPER CRETACEOUS TELEOSTS 
However, even on the larger specimens, not all the scales are ctenoid, those scales 
on or near the head are cycloid, the ctenoid scales being confined to the mid-body 
region. 
Order CTENOTHRISSIFORMES 
Family AULOLEPIDAE Patterson, 1964 
Di1aGnosis. See Patterson (1964 : 247), except that post-temporal fossa is occa- 
sionally roofed. 
Genus PATTERSONICHTHYS nov. 
DiaGnosis. Aulolepidae in which the post-temporal fossa is roofed. Length of 
the head greatly exceeds the depth of the trunk. Operculum devoid of scales. 
Vertebrae 30 in number of which 17 are caudal. Dorsal fin with 13 or 14 rays ; 
anal fin behind rear of dorsal with ro rays. 
TYPE SPECIES. Pattersonichthys delicatus. 
REMARKS. The genus Pattersonichthys is erected to contain several small speci- 
mens from Hajula, Lebanon. The generic name is dedicated to Dr. Colin Patterson 
of the B.M.N.H. | 
Pattersonichthys delicatus sp. nov. 
(Text-figs. 73-77) 
Diacnosis. As for genus, only species. 
HoLotyre. B.M.N.H. specimen number P.9976, a complete but flattened fish, 
from the Middle Cenomanian, Hajula, Lebanon. 
MATERIAL. The holotype and two further specimens, P.g977a and P.9977), also 
from the Middle Cenomanian, Hajula. All three specimens were prepared in 
acetic acid by the transfer method. 
DESCRIPTION. Neurocranium. The neurocranium appears relatively shallow, 
and is deepest in the occipital region. The parasphenoid, visible in the base of the 
orbit, is straight. The frontals are flat, although the lateral edges curve down to 
form the dorsal margin of the orbits. The frontal tapers anteriorly to insert on to 
the dorsal surface of the mesethmoid and is unornamented. In the posterior region 
of the cranial cavity an incompletely roofed post-temporal fossa is present. The 
roof of the fossa has a curved indentation posteriorly. The frontal extends laterally 
above the dorsal surface of the sphenotic at the hind end of the orbit, and medially to 
cover the anterior half of the cranial cavity. Posteriorly the frontals contact the 
parietals and the pterotics. The pterotic makes up most of the postero-lateral 
edge of the neurocranium, meeting the sphenotic anteriorly and the frontal and 
parietal medially. The lateral faces of the pterotic and sphenotic are deeply 
excavated to form the dilatator fossa. The upper border of the fossa is delimited 
by a low crest on the pterotic passing backwards from beneath the frontal. The 
