Davis—On the Fossil Fishes of the Chalk of Mount Lebanon. 623 
perfect specimens have been discovered, it will be well to regard it as a variety 
of the species already described. The part preserved is 12°5 inches in length; 
of this the head occupies 5 inches, the remainder consisting of the anterior 
portion of the vertebral column; the latter does not materially differ from that 
of L. triqueter, except in size. The head is not well preserved, the termination of 
the snout is broken away. The lower jaw is 3°5 inches in length, the upper one 
being proportionately large; both are filled with a large number of teeth similarly 
recurved and pointed to those of the species already described. The upper part 
of the head is not well preserved. 
Formation and Locality.—Soft chalk: Sahel Alma, Mount Lebanon. 
£z coll.—Lewis Collection; Natural History Department, British Museum. 
Leptotrachelus gracilis, Davis. 
(Pl. xxxvui., fig. 3.) 
In the collection at the new Natural History Museum there are examples of 
a Leptotrachelus which are extremely long and slender as compared with the type 
specimens already described. They are 9 inches in length; the greatest depth 
of the body is 0°3 of an inch. The head is 1:3 inch in length, and its greatest 
depth behind the orbit is 0°35 of an inch. The dorsal fin is not well preserved, 
but its anterior rays are 4 inches in front of the base of the tail. The ventral 
fins are 3°3 inches from the tail. The anal fin is 1:1 inch before the caudal; its 
rays are longer, but the fin has not quite the same basal length as in the type. 
The head is triangular and terminates with an acutely-pointed snout; the jaws 
are furnished with teeth, recurved, acutely-pointed, and larger in proportion to 
the size of the head than in the types. The dermal scutes are somewhat more 
angular and more acutely-pointed than in the larger specimens. 
Formation and Locality—Soft chalk: Sahel Alma, Mount Lebanon. 
Ex coll.—Natural History Department, British Museum. 
Leptotrachelus hakelensis, Prcrer and HuMBrrr. 
L. hakelensis. Picrer and Humpert, 1866. ‘Nouv. rech.s. les poiss. foss. du 
Mt. Liban.,” p. 98, pl. x1v., fig. 3. 
L. hakelensis. Fraas, Oscar, 1878. ‘Aus dem Orient. II. Theil. Geolog. beo- 
bachtungen am Libanon,” p. 92. 
Several examples of this small species have been added to the National and 
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