Davis—On the Fossil Fishes of the Chalk of Mount Lebanon. 595 
its'seventeen rays, supported by the same number of interneural rays, have a 
base extending 0-6 of an inch along the dorsal surface. The fin-rays are strong, 
and are articulated in the distal half of their length. 
The anal fin is very near the caudal, its posterior extremity being removed 
only 0:2 of an inch; its base extends 0°8 of an inch. The fin-rays are short 
and stout, sixteen in number, and are supported by an equal number of inter- 
hemal spines. In the caudal fin the rays of both superior and inferior lobes 
are closely aggregated, and extend almost at right angles to the body of the fish. 
The arrangement is probably accidental. The rays are thick near the base, but 
dichotomize repeatedly, and assume a filamentous appearance at the margin of 
the fin. All the rays are articulated. 
Of the paired fins the pectorals are the larger; they are attached to the 
scapular arch very near to the ventral margin. The scapular arch is strong, and 
encircles the convex margins of the opercula. he pectoral fins are 1:0 inch each 
in length, though slightly imperfect, the rays are aggregated, and the number 
cannot be ascertained with exactitude, but there are at least fifteen. The ventral 
fins are each situated 0:6 of an inch before the anterior ray of the anal and 
opposite to the posterior portion of the dorsal fin; each is supported by a strong 
triangular pubic bone; the fin-rays are 0°6 of an inch in length and are not 
numerous, The scales on the under surface of the body, beneath the skeleton, are 
preserved; they were thin, circular, and a medium size. 
An interesting fact in connexion with this specimen is that the nature of its 
food is indicated by the presence of a small fish, probably a Leptosomus, fossilized 
in the abdominal cavity. The included fish is 1°5 inch in length; its vertebral 
column and fins are distinctly discernible ; the head occupies its proper relative 
position, but is somewhat crushed, or may have been disturbed by the process of 
digestion. The stomach appears to have extended to a considerable distance 
behind the ventral fins; the body of the included fish reaches 0°5 of an inch 
behind them. 
This specimen possesses several peculiar features which render its allocation 
to any of the genera hitherto described somewhat problematical. The arrange- 
ment of the fins correspond in number with those of Clupea; they are situated 
near the caudal extremity of the fish, and in this resemble the species already 
described in this memoir, C. pulchra and C. elongata; it differs from these, 
and from all other species of Clupea, in the position of the ventral fins relatively 
to the dorsal; instead of being opposite or slightly in advance of the dorsal fin, 
they are behind it, and the somewhat extended anal is forced almost to the 
base of the caudal. The genus Spaniodon presents features similar to this 
specimen, though the dorsal is in each species of that genus placed midway along 
the body. Of the three species of Spaniodon described by Pictet (Op. cit.), 
S. breyis most nearly resembles this; but its large head, slender body, and 
