52 
ACTINOPTEETGII. 
55 in number, the centra more elongated than in the type species. 
Fins as in the type species.' 
Form. Loc. Upper Cretaceous : Sahel Alma, Mount Lebanon. 
46521. Very large fish, partly shown only in impression, displaying 
the principal characters of the species. Lewis Coll. 
P. 1878. Specimen about 0*2 in length. ' Egerton Coll. 
48070. An equally large specimen displaying the head, which is 
shown of the natural size in PI. YII. fig. 3. The head is 
exposed from the left side, and is a little obliquely crushed 
80 that the imperfect left mandibular ramus is displaced 
upwards. The cranium is shown to be elongated and 
depressed, with a straight basicranial axis. The pterygo- 
quadrate arcade is shown to be delicate and apparently 
toothless ; while the mandibular suspensorium is almost 
vertical, though arched, and the articular end of the 
mandible is beneath the back of the head. The front 
half of the left facial region is broken away, so that the 
characteristic maxilla of the right side is partly exposed 
from within, and there seem to be traces of a very short 
premaxilla at its anterior end. Above the maxilla {mx.) 
the large antorbital cheek-plate is seen (a.o.), partly 
fractured and displaying the radiating branches from the 
slime-canal. Below the maxilla, adjoining the remains 
of the mandible (d.), there is an impression of the large 
conical tooth at its symphysis. Between the mandibular 
rami the left ceratohyal is partly exposed ; and the series 
of branchiostegal rays is well displayed on this side, 
about 15 in number. Immediately behind the mandibular 
suspensorium, the preoperculum {p.op.) is well preserved, 
with a large triangular expansion at its lower end, marked 
with a few radiating branches of the slime-canal; but 
the operculum and suboperculum behind are too much 
crushed and fractured for recognition. Just behind the 
operculum there are traces of the thickened anterior 
neural spines. Lewis Coll. 
P. 5997. Another large specimen apparently elongated by distor¬ 
tion. Lewis Coll. 
44831,46516, 46519-20. Four nearly complete fishes. Lewis Coll. 
