178 
ACTINOPTERYGII. 
those in advance of the pelvic fins being comparative j 
slender. Most of those in the caudal region are expose 
from the inner aspect, and the uncinate spine is t n 
only visible on a few dorsal scutes of the caudal pedic 
There are traces of scutes on the flanks, but they arc 
distinct. Lewis Coll. 
49541. Equally large fish, the head and anterior abdominal regie' 1 
exposed from below, the remainder of the trunk from t 
side ; Sahel Alma. The imperfect long and slender man 
dible is shown from below, the ramus of the right side wit 
five large pits in sparse longitudinal series at its anteiior 
end. A fracture seems to indicate the division 
the dentary and articulo-angular elements ; if s0 ’ 
latter is almost as long as the former. Traces of TC 
slender brauchiostegal rays are observed behind, seven 
being indicated on the right, and possibly more on ^ 
loft side. Slightly more than seventy vertebra) can ^ 
counted, and Borne of the characteristic centra 111 T 
anterior abdominal region exhibit the laminar transv ci - 
processes. The pectoral fins are imperfectly preserve o' 1 
each side of the trunk, and that of the right distinc ) 
indicates eleven rays, the hindermost excessively delica ®* 
The pelvic fins are shown only in a fragment oppo® 1 
the anterior end of the dorsal fin, of which the foremos^ 
nine or ten rays are preserved. The anal fin 18 1 
destroyed, but the caudal fin is not much injured, 
marginal scutes are of the usual form and proportions, 
distinctly in continuous series along the base of the dor® 
and anal fins ; some on the ventral border of the 
caudal region are exposed in side-view and display 
relatively large uncinate spine, which becomes gtos _ • 
reduced on the corresponding scutes of the caudal pc 
The appearances on the flank are difficult of interp rl ^^^ 
tion ; but below the vertebral column just behind ^ 
pectoral fins there is a scries of narrow heart-shap ** 
scutes shown from the inner face, which seem to 8 
borne a median longitudinal keel; and below these ®o a ’ 
especially a little further back, there are traces of 1 
oblique lath-shaped plates, which are still better 1 „ 
on the caudal region. At the base of the ana ^ 
indeed, three of these lath-shaped plates seem to ^ 
directly continuous with tho postero-superiorly inC 111 
