626 Davis—On the Fossil Fishes of the Chalk of Mount Lebanon. 
The pectoral fins are situated immediately behind the opercular apparatus, 
one-third the height of the fish above the ventral line; each consists of nine rays, 
the anterior of which is 0°5 inch in length, thick and strong; each succeeding one 
diminishes in size as well as length. 
The ventral fins are not well defined, but appear to be present on one specimen; 
they are smaller than the pectorals, from which they are separated by a distance 
of about 3 inches, and are attached at a point nearer the median ventral line than 
are the pectorals. 
A slight discolouration of the stone is the only indication of the external 
covering of the fish. If scales were present it is probable that they were very 
minute. 
Formation and Locality.—Soft chalk: Sahel Alma. 
Ex coll—Natural History Department, British Museum. 
Anguilla hakelensis, Davis. 
(Pl. xx... fig. 3.) 
A second species of this genus, considerably smaller than the one already 
described, occurs in the hard chalk of Hakel. Two specimens are in the National 
Collection. The larger one is 3-7 inches in length, of this the head occupies 0°5 
inch. The greatest height of the fish is not more than 0°3 inch. The number of 
vertebre in this specimen is 107, one-third in excess of that of Anguilla sahel-alme. 
The head is broadest and highest posteriorly, tapering forwards; the jaws are 
longer, in proportion to the size of the fish than those of the species from Sahel Alma, 
and the orbit is situated lower. The components of the head are displaced and 
not well preserved ; the operculum probably extended further backwards, and was 
not so high in proportion to the breadth. Branchiostegal rays are exposed ; they 
are long and slender. 
The vertebral column is composed of vertebrae of which the length is equal to 
the height; the median part is not so much constricted as in those of A. sahel-alme. 
The anterior portion of the spinal apophyses is not preserved ; neural and hemal 
spines are attached to the remainder; they are shorter and thicker, as well as less 
curved backwards than those of the species previously described. Fragments of 
a dorsal fin remain, which extended apparently the entire length of the back to 
the tip of the tail, and thence recurved on the ventral surface, in combination with 
the anal fin. The fin-rays are short and very fine ; the tail is undivided. 
Of the paired fins the pectorals were situated immediately behind the oper- 
culum on the thorax; they were small and fine, apparently devoid of the strong 
anterior spinous ray found in A. sahel-alme. 
Formation and Locality.—Hard chalk: Hakel. 
Lx coll.—Natural History Department, British Museum. 
