476 Davis—On the Fossil Fishes of the Chalk of Mount Lebanon. 
The pectoral and ventral fins are exposed; the former are situated 2°5 inches 
from the snout, and extend 1°3 inches along the base; the external margin is 
1‘5 inches in length. The basal part of the fins is supported by about ten 
cartilaginous rods, each 0:3 of an inch in length. An apparently dense and 
strong cartilaginous pectoral arch supported the fins, and to this the cartilaginous 
rods are attached. The ventral fins are much smaller than the pectorals, and 
situated 3 inches behind their anterior basal margin. 
The dorsal fins cannot be seen. The anal fin is about 1:5 inches behind 
the ventrals: its base is 0°8 of an inch in length, and it extends 0°5 of an inch 
along the anterior margin. The caudal fin is not satisfactorily preserved. 
The whole of the body, head, and fins are enveloped in a covering of minute 
dermal ossicles, larger on the abdominal surface of the body, but smaller on 
the fins, and very minute towards their extremities. The larger ossicles are 
striated on the surface, the striee being produced along the anterior margin so as to 
give it a dactylous appearance; the median striation is longest, and extends to 
the point of the rhomboidally-shaped scale. 
Formation and Locality.—Upper Cretaceous: Sahel Alma, Mount Lebanon. 
£x coll.—Tristram Collection, British Museum, South Kensington. 
Family. SCYLLIIDZ. 
Genus. Scyllium. 
Scyllium Sahel Alme, Picrer and HumsBert. 
(PIL xy.,, fig. °3:) 
[‘‘ Nouv. Recher. sur les Poiss. foss. du Mt. Liban.,” p. 11, pl. xvm., figs. 2-4. ] 
A specimen of this fish in the National Collection exhibits some of the 
characters wanting in those figured by the authors cited above. Its total 
length is 7 inches; of this the head, including the branchiostegal rays to the 
base of the pectoral arch, is 1-4 inches, to the ventral arch is an additional 
1:2 inches. The anal fin is 1°5 inches behind the ventral arch. It consists 
of nine short rays; the outline of the fin is not preserved. The number of 
vertebre is 125; the pectoral arch is attached to the fourth, and the ventral 
to the twenty-second; anteriorly the vertebre are as long as high, posteriorly 
the height is much less than the length. The vertebree behind the ventral arch 
have attached to them neural and hemal apophyses, the terminations of which 
are connected longitudinally. 
