DERCETIDJ5. 
m 
displayed from the attached face, and only one specimen 
on the upper border of the caudal pedicle exhibits the 
uncinate spine. There are distinct traces of similar 
scutes along the base of the dorsal fin. Some of the 
obliquely-directed lath-shaped plates are observable on tho 
caudal region. Lewis Coll. 
49540. Pish about 0-3 in length, vertically depressed anteriorly, 
shown in lateral aspect from the middle of the abdominal 
region backwards, noticed and figured in ‘ Natural 
Science,’ vol. xii. (1898), p. 258, pi. x. ; Sahel Alma. 
The specimen is interesting as enclosing an undigested 
fish 0-075 in length, which has been swallowed as usual 
head foremost, and distends the hinder abdominal region 
from a depth of less than 0'015 to more than 0-02. 
Among the fractured remains of the head the character- 
istic end of the rostral region is distinct, ornamented by 
a few smooth longitudinal ridges. Behind tho head the 
pectoral fin is shown fragmentarily on each side. Nine 
rays seem to be indicated on the right side, those beyond 
the foremost fonr being comparatively delicato and short, 
but all with widely-spaced articulations at the distal end 
and the majority bifurcated. The foremost ray on the 
left side, also showing distal articulations, measures 0'02 
in length. The number of vertebra) exhibited seems to 
be about 80. The pelvic fins, represented by that of the 
left side displaced downwards by tho distended stomach, 
are as large as the pectorals, and nearly similar, but 
apparently with stouter rays which are only six in 
number. The pelvic fin-support is a delicate expanded 
lamina, not clearly seen. The anal fin is well-preserved, 
about twice as deep as long, comprising seven or eight 
stout, closely-arranged rays, each undivided in the 
proximal half, bifurcated and with distant articulations 
in tho distal half. The distance between this fin and the 
pelvic pair (displaced) is somewhat less than that between 
the latter and the pectorals, and not quite twice as great 
as that between its origin and the caudal. The dorsal fin 
is wanting. The caudal is a little crushed, but exhibits 
the characteristic bifurcation. The triradiate dorsal and 
ventral scutes are shown along the entire length of the 
trunk as far forwards as the pectoral arch, except above 
the distended stomach and the base of the anal fin ; all 
part iv. 
N 
