ENCHODONTID^. 
231 
somewhat less than half the length of the trunk from the pectoral 
arch to the base of the caudal fin; maximum depth of trunk 
contained about seven times in the same measurement. Pelvic 
fins arising somewhat in advance of the middle point of the trunk, 
opposite the hinder part of the dorsal fin, which comprises about 
16 rays and is completely within the anterior half of the trunk ; 
anal fin comparatively low and small, with about 14 rays, arising 
much nearer to the caudal fin than to the pelvic pair. Lateral 
dermal scutes between 40 and 50 in number, and the largest about 
five times as deep as broad, with the forwardly directed portion 
above the lateral line two thirds as deep as the portion below it; 
the hinder margin deeply pectinated, though rather irregular, and 
the uppermost pectinations the longest; the anterior portion 
marked with delicate and irregular vertical rugge. 
Form. Log. Upper Cretaceous : Mt. Lebanon. 
P. 4864. Large fish in lateral aspect, wanting the dorsal and 
caudal fins; Hakel. The pelvic fins are shown to be 
about as large as the pectorals, and the pelvis is very well 
displayed. The laminar pelvic bones taper forwards, and 
are firmlv united at their distal end in an inter-digitating 
suture. Lewis Coll, 
P. 9149. Another large fish vertically crushed and partly in 
counterpart; Hajoula. An imperfect impression of the 
cranial roof seems to indicate a median hollowing and a 
lateral ornamentation of radiating lines and tubercles ; 
while the ethmoidal region is clearly short and broad, 
though acutely pointed in front. The jaws are very 
imperfect, but they are proved to have been delicate ; 
while the only remains of dentition are one slender 
lanceolate tooth in front and clustered minute blunt 
teeth behind. Posterior to the outwardly crushed cheek 
on either side there are remains of the narrow pre¬ 
operculum and the well-developed operculum; and the 
latter plate is shown to have been strengthened not only 
bv the thickening of its anterior border, but also by 
a horizontally-directed ridge on its inner face, while the 
upper half of its outer face is marked with numerous 
delicate radiating lines which are partly tuberculated. 
The vertebral column is imperfectly preserved, comprising 
delicate constricted centra, longer than deep, each 
distinctly pierced for the persistence of the continuous 
notochord. The ribs seem to be short and comparatively 
