Davis—On the Fossil Fishes of the Chalk of Mount Lebanon. 511 
The dorsal fin is large, situated on the median portion of the back between 
the occiput and the tail; the number of its rays is considerable, probably fifteen 
or sixteen, but they cannot be counted with exactitude; they are 1:8 inch 
in length, the basal part undivided ; distally they are both divided and articulated. 
The first ray appears to have been short and spinous. The anal fin is not 
present; its position is indicated by the interhemal spines; it had a_ basal 
extent of 1:0 inch, and was separated from the tail by about 0°3 inch. The 
caudal fin is large and deeply lobed. The length of the upper lobe is 1°5 inch; 
the extremity of the lower has become detached. The upper lobe consists of 
twelve rays, the outer ones thick and strong; the lower one possesses ten rays: 
each is strengthened by six or seven imbricating rudimentary rays. 
No trace of the pectoral fin remains. The ventral is abdominal, about 1:0 
inch behind the head or midway in the length of the body without the tail. It 
is composed of ten or twelve rays, the anterior one strong and curved backwards. 
The scales are large, 0°2 inch in height and rather less than 0-1 inch of the width 
is exposed. The free posterior margin is circular and minutely denticulated. 
The scales are only preserved in small patches, not sufticiently to ascertain 
the number. The lateral line can be distinguished: it is straighter than the 
spinal column and mostly slightly above it. 
The character of the scales, the form and arrangement of the fins and the 
opercular bones clearly indicate the Berycoid affinities of this species. The 
abdominal position of the ventral fin removes it from the genus Beryx, Cuvier, 
whilst it points with equal clearness to that of Pseudoberyx, Pictet and Humbert, 
with which it also agrees naturally in other respects. Its large size and more 
robust anatomy, the length of the rays of the dorsal fin, and the height of the 
peduncle of the tail distinguish this species from those already described. 
Formation and Locality.—ard chalk: Hakel. 
Ex coll.—Lewis Collection, Natural History Museum, South Kensington. 
Pseudoberyx longispina, Davis. 
(ly xxv fig2:) 
The unique specimen which forms the type of this species formed a part 
of the magnificent collection made by Professor Lewis. It is 2°5 inches in 
length, including the head, which is 0-9 inch; the tail, from its base to the 
tip of its upper lobe, is 1-0 inch; the lower lobe is shorter. The height in 
front of the dorsal fin is 1-0 inch: it diminishes rapidly towards the snout, and 
in the opposite direction to the tail; the height of the peduncle of the latter 
is 0-4 inch. The great development of the dorsal fin, extending to nearly 
2 inches in length, forms a peculiar and striking feature of the fish. 
4A2 
