82 
ACTINOPTERYGII. 
The course of the sensory canals on the trunk can be traced by 
perforations and notches in the scales, which never produce a super¬ 
ficial ridge. There is one principal lateral line, as usual, and a 
second proceeds above on each side from the outer supratemporal to 
the origin of the dorsal fin, but apparently not beyond. 
The species of Lepidotus are numerous, and many are only 
imperfectly known. The following synopsis of those described 
below shows the nature of some of the specific characters :— 
I. Inner teeth on long pedicles, not much en¬ 
larged. Scales smooth. 
Parietals less than half as long as frontals, 
which are three times as long as broad 
and united by slightly wavy suture ; 
operculum two-thirds as broad as deep ; 
scales in part serrated. elvensis, p. 84. 
Ditto, but median frontal suture more wavy, 
parietals longer, and fish more elongated semiserratus , p. 85. 
Parietals at least half as long as frontals, 
which meet in a nearly straight median 
suture; operculum two-thirds as broad 
as deep ; scales not serrated . gallineki , p. 87. 
Parietals half as long as frontals, which are 
twice as long as broad and united by 
deeply sinuous suture; operculum two- 
thirds as broad as deep ; principal flank- 
scales conspicuously denticulated. latifrons, p. 89. 
Parietals less than half as long as frontals, 
which are three times as long as broad 
and united by nearly straight median 
suture ; principal flank-scales conspicu¬ 
ously denticulated . macrocheirus, p. 90. 
Operculum twice as deep as its maximum 
breadth, which is contained more than 
three times in the length of the head ; 
very few scales serrated, but those of 
lateral line notched. notopterus , p. 92. 
Parietals about one-third as long as frontals, 
which are three times as long as broad 
and united by nearly straight median 
suture; operculum somewhat less than 
twice as deep as its maximum breadth, 
which is contained nearly three times in 
the length of the head; few scales in part 
serrated, but those of lateral line notched, minor , p. 94. 
II. Inner teeth on comparatively short pedicles, 
much enlarged. 
(a.) Scales smooth. 
Operculum nearly twice as deep as broad; 
