Davis—On the Fossil Fishes of the Chalk of Mount Lebanon. 597 
Eurypholis longidens, Picrer. 
Isodus sulcatus. Hecker, 1843. ‘ Fische Syriens,” p. 241 (343), pl. xxuut., fig. 4. 
E. longidens. Picret, F. J., 1850. ‘‘Dese. de quelques poissons fossiles di 
M. labans” 9p. 31, pl. ve, die, 1. 
E. longidens. Picrer et Humpert, 1866. ‘ Nouy. rech. sur les poissons fossiles 
du M. Liban.,” p. 105, pl. xvu. 
It is probable that a portion at least of the fish remains ascribed by Professor 
Pictet to this species must be transferred to the genus Eurygnathus. The reasons 
for this are given with the necessary detail in the description of the latter genus 
on page 601. 
Formation and Locality.—Soft chalk: Sahel Alma, Mount Lebanon. 
Ez coll_—Museum at Geneva. 
Lurypholis mayor, Davis. 
(Pleax.7ifig.2)) 
A very fine example of this genus is included in the collection made by the 
Rey. Professor Lewis, and now in the National Collection at South Kensington. 
Its length is 11°5 inches; of this the head occupies 3:3 inches and the tail 
2°2 inches. The greatest depth of the body is immediately behind the head, 
1:7 inch; it gradually diminishes towards the base of the tail, which is less 
than 0°5 inch in height. The lobes of the tail are deeply cleft and widely 
expanded, the extremities being 3°0 inches apart. ‘The fins are well preserved, 
and differ considerably from those of Eurypholis boissieri of Pictet. 
The head is large, fully as high as the anterior part of the body, its length 
nearly double the height. The upper surface of the snout is depressed and the 
bones of the mouth prominent. The jaws are 2°3 inches in length, the gape 
wide; both the mandible and maxillary are nearly straight, strongly osseous, 
and armed with a number of sharp, conically elongated teeth. The pre-maxillary 
is apparently short, and affords support to the teeth, few in number, but longer 
and thicker than those of the maxillary bones. ‘The bones of the upper part of 
the head, including the orbit, are for the most part absent. The operculum was 
lirge, extending backwards with a gentle curvature, its inferior posterior margin 
somewhat angular. The branchiostegal rays, apparently short and thick, are 
preserved. 
‘The vertebral column is composed of forty vertebrae, 0-2 inch in length and 
ubout the same height; they are constricted in the middle, and somewhat longer 
TRANS. ROY, DUB. SOC., N.S. VOL. III. 4M 
