614 Davis—On the Fossil Fishes of the Chalk of Mount Lebanon. 
portion of the alveolar surface is armed with teeth of two kinds, a series of large, 
recurved, pointed teeth placed at intervals, and separated by six smaller ones 
between each. The posterior part of the jaw, reaching from an inch behind the 
point, is closely set with minute, conical, pointed teeth. 
The jaw appears to be somewhat similar to the lower jaw of R. longirostris, 
Davis, but it is very much larger, and the teeth are different, the presence of the 
large laniary teeth in this specimen readily distinguishing it. It is distinguished 
from R. ferox by the character of its teeth; the smaller ones are more numerous 
and are conical. 
Another specimen from the collection of Mr. Lewis, at the British Museum, 
exhibits a portion of the head, but the snout and the whole of the body is absent. 
Its height immediately behind the orbit is 1:2 inch, and the length preserved is 
3°0 inches. The orbit is situated high in the head; it is not so broad as in 
R. ferox from Sahel Alma. The anterior part of the operculum is preserved, 
and the posterior terminations of some of the branchiostegal rays may be observed: 
they are long and slender. A series of ridges radiate from the central part of 
the anterior surfaces of the operculum towards its inferior and posterior margins. 
The proximal portions of the maxilla and mandible only are preserved; they 
possess the characters already described. The superior margin of the snout is 
minutely serrated along the entire length of the snout preserved. 
Formation and Locality.— Hard chalk: Hakel, Mount Lebanon. 
Ex coll.—Lewis Collection, Natural History Department, British Museum. 
Rhinellus ferox, Davis. 
(Bie xxxyit., fig. 1.) 
The specimens from which the description of this species is taken are in the 
Natural History Museum at South Kensington. The most perfect, represented on 
the plate indicated above, is from the collection of Mr. Lewis. The head, body, 
and tail are preserved; the dorsal and mid-ventral surfaces are imperfect, a 
portion of each having apparently been lost during the extraction of the fossil 
from the matrix. Fortunately other specimens occur from which the characters 
of the missing parts can be deduced. 
The total length of the body, from the snout to the tip of the tail is 16 inches. 
The head occupies 6°8 inches of this length, and the tail 2°5 inches; the body, 
from the base of the tail to the posterior margin of the operculum, is 6°8 inches, 
exactly equal to the length of the head. The greatest height is 1:4 of an inch 
immediately behind the pectoral fins; it changes little for 4 or 5 inches, but 
beyond that distance diminishes rapidly to the base of the tail, which is 0°8 of 
an inch in height. 
