504 Davis—On the Fossil Fishes of the Chalk of Mount Lebanon. 
backwards. The anterior ray is opposite to the twenty-sixth of the dorsal fin. 
The caudal fin is not perfectly preserved. The caudal vertebre are turned 
upwards, so that the terminal vertebree approach very nearly to the dorsal 
margin of the fish. From the convex, under side of the column, a series of 
apophyses extend and support the rays of the tail; they are sixteen to twenty in 
number, strong and cylindrical at the base, expanded and spatulate at the distal 
end. The anterior one is an inch in length, succeeding ones gradually diminish. 
The rays of the tail are large and strong, solid for a short distance, then 
articulated and divided; only about an inch of the basal portion is preserved. 
The peculiar heterocercal form of the tail, combined with a strong osseous 
framework, appears to separate this fish from other genera previously described 
either from Lebanon or other localities. As previously stated, the resemblance 
of the caudal extremity to that of Lepidosteus indicates an affinity with the 
Ganoids; at the same time, it cannot be denied that the arrangement of the fins 
points more in the direction of some of the Teleostean groups; and it may be 
possible that the discovery of specimens which exhibit the complete anatomy of 
the fish may serve to indicate more closely some of the characters which appear to 
connect the Teleosteans with the Ganoids. 
Formation and Locality Hard chalk: Hakel. 
Ex coll.—Lewis Collection, Natural History Department, British Museum, 
South Kensington. 
Genus. Amphilaphurus.* Davis. 
Fish, only caudal portion preserved. Vertebral column thick and strong, 
terminating heterocercally. Caudal fin supported from the lower convex surface 
of the vertebree by hemapophyses; peduncle of tail and the tail very thick. Anal 
fin small, remote from the caudal. Posterior part of dorsal fin situated at half 
the distance from the caudal, which separates the latter from the anal. 
This genus approaches nearer to that of Spathiurus than any other found in 
the hard or soft chalk of Mount Lebanon. But, whilst Spathiurus is apparently 
a more or less flat-bodied fish, with well-developed and extended dorsal and anal 
fins, this one has a long and rounded body, and the anal fin, at any rate, is 
small and remote. 
Amphilaphurus major, Davis. 
(Pl. xxiv., fig. 2.) 
The caudal extremity of a large fish, The remaining part is broken away at 
the anterior extremity of the ventral fin; a small part of a dorsal remains, and 
* auplAadys, massive; ovpa, a tail, 
