488 Davis—On the Fossil Fishes of the Chalk of Mount Lebanon. 
any other hitherto described. The body, head, and fins are covered with 
dermal ossicles, more or less triangular and pointed. 
The head is of an oval form, 3°5 inches in length and 3 inches in breadth. 
The mouth is 8:2 inches behind the end of the snout, has the usual form, 
and is 13 inch in width posteriorly. It contains a very large number of 
minute, conical, and sharply-pointed teeth. Extending along the base of the 
nasal prominence there is a strong chondroid bone; beginning immediately 
behind the buccal orifice, it is 0°5 of an inch in width; in a distance of 0:8 
of an inch it expands to a diameter of 0°9 of an inch and becomes divided 
into two long rods: these run parallel for 5 inches and gradually coalesce 
again and thence continue to the termination of the snout. From each side the 
widest part of this cartilaginous rod there extends a horn-shaped process which, 
ending in a point anteriorly, expands posteriorly, and forms a broad plate 
reaching to the upper jaw, apparently to support the wide lateral expanse of the 
snout. The posterior part of the head is not very well defined, the matrix 
being slightly displaced; a strong chondroid bone extends backwards from the 
mouth towards the pectoral arch, and on each side of it a series of branchiostegal 
rays can be distinguished occupying the space, bounded on each side by the 
pectoral arch. 
The spinal column consists of vertebrz well ossified; they are 0°15 inches in 
length and 0:1 of an inch in transverse diameter; from the pectoral arch 
backwards as far as the fish is preserved there are fifty-five vertebree, of which 
fourteen appear to be comprised between the pectoral and ventral arches. Ribs, 
bifurcating at the base, are attached to the vertebral column. 
The pectoral arch is strong, the posterior flexion forming a thoracic cavity 
2-6 inches in diameter. The pectoral fins extend from a point 7°4 inches behind 
the termination of the snout for a distance of 7-2 inches backwards. They 
are widest at a distance of 5 inches from the anterior termination, where they 
are 2°7 inches; from this point anteriorly the margin is deeply concave, posteriorly 
the fin is expanded and the margin convex. The fin is supported by forty-eight 
rays attached at their basal extremity to the pectoral arch, and repeatedly 
jointed and divided towards their distal extremity. The ventral fin is large, 
and supported by sixteen or eighteen rays. Its length along the basis is 
3 inches, the anterior margin 2 inches, and it extends from the body a little 
more than 1 inch. Its form is the same as that of the pectoral fin in miniature. 
This species 1s unlike any previously described specimen from Mount Lebanon. 
Its prolonged and attenuated snout, the minute and closely aggregated teeth, 
the pendant, posteriorly-expanded form of the pectoral fin, and the elongated 
vertebra readily distinguish it from any other species. 
Formation and Locality.—Upper Cretaceous: Sahel Alma, Mount Lebanon, 
Ex coll—tLewis Collection, British Museum. 
