h, which is low down--the under jaw when extended, being nearly on a
line with the belly. The height of the tail between the vertical fins is
equal to half the greatest height of the body. The dorsal and ventral
lines are both acute, especially the former, and the medial line of the
nape continues acute to the orbits.

The length of the head, measured from the upper jaw, is contained four
times and a half in the total length of the fish. The large round eye,
situated near the upper profile, fills more than a quarter of this
length. The orbit is surrounded by a ring of muciferous canals, with open
orifices, which are the only exterior vestiges of the suborbitar chain.
The small mouth descends obliquely and scarcely reaches back to the
orbit. The intermaxillaries are moderately protractile, but the lower
jaw, when depressed, projects still further forward. The maxillary widens
towards its lower end, which curves a little forwards. Three pores exist
on each limb of the lower jaw.

The teeth of the upper jaw present a fine, but rather uneven and broad
cardiform surface at the symphysis, which narrows to a single row towards
the corner of the mouth, where they are a little longer and more
subulate. Four canine teeth stand across the end of the jaw anterior to
the dental plate, the intermediate ones being shorter than the outer
ones. The dentition of the under jaw differs in the dental band being
narrower, and in there being a conspicuous canine in the middle of each
limb of the jaw. There are also six canines standing across the extreme
tips of the jaw, opposed to the upper ones. Most of the teeth are
slightly curved backwards. The chevron of the vomer projects from the
roof of the mouth, and its surface is armed by minute teeth in about
three or four densely crowded rows. The palatine teeth are still more
minute, and the band is four or five deep. The teeth, when examined with
a lens, appear to be very acute and in nowise spherical. The pharyngeal
teeth are subulate and acute, and of unequal heights. There seems to be
only one inferior pharyngeal bone below; but without dissection this
could not be clearly made out. The outer branchial rakers are long.

The narrow, slightly pitted, scaleless disk of the preoperculum bounds
the scaly cheek behind and below, and has an entire edge with neither
spine nor acute angle at the bend. The other pieces of the gill cover are
closely covered with scales, only a little smaller than tho