Davis— On the Fossil Fishes of the Chalk of Mount Lebanon. 537 
between the dorsal and ventral surface, and is attached to a powerful scapular 
arch, which also descends and affords support to the ventral fins. The latter is 
slightly in advance of the pectoral fin, and consists of a number of rays, six of 
which can be determined, strong, and, so far as preserved, undivided by articu- 
lations. The anterior ray is a pointed spine, 0°6 inch in length, and slightly 
curved. 
The scales are not well preserved; they were moderate in size, with rounded 
posterior margin. The lateral line is marked by a series of pointed scales, thicker 
than the others, about 0-1 inch higher than the line of the vertebral column near 
the head, and approaching and extending over it on the caudal extremity of the 
body. 
This beautiful species, which I have taken the liberty of naming after its 
discoverer, Prof. Lewis, may be readily distinguished from those already 
described by the number and size of the spinous rays of the dorsal and anal 
fins. In this respect it approaches the genus Hoplopteryx, and it is not without 
some doubt that the species is placed with Pycnosterinx; but the position of 
the ventral fins almost in advance of the pectorals appears to indicate its rela- 
tionship with this genus rather than with Hoplopteryx, in which the ventral 
fins are situated abdominally, and much farther back. 
Formation and Locality—Hard chalk: Hakel, Mount Lebanon. 
Ex coll.—Lewis Collection, Natural History Department, British Museum. 
Pyecnostering elongatus, Prcrer et HumBerrt. 
P. elongatus. Picrer et Humpert, 1866. ‘‘ Nouy. rech. sur les poiss. foss. du 
Mont Liban.,” p. 42, pl. ur, figs. 5, 6. 
This species is somewhat doubtfully placed in the genus Pycnosterinx because 
of its elongated form; but, apart from this circumstance, its characters agree in 
general with those of the genus, and it is considered advisable to retain it in 
its present position. ‘The description of the specimens figured by the authors 
named above renders any further comment unnecessary. 
Formation and Locality.—Upper Cretaceous: Sahel Alma, Mount Lebanon. 
Ex coll—Museum at Geneva; common. 
Pycnosteriny daviesii, Davis. 
(Pl. xx1x., fig. 2.) 
Length of the body, exclusive of the tail, 2°7 inches; of this the head 
occupies one-third. The greatest height is behind the head, 1°5 inch; thence 
