128 
ICHTHYOLOGY 
times in the same ; the eye is three times and a-half in the 
length of the head. The praeorbital spines are very small ; those 
of the praeoperculum very large, but further apart than in 
Richardsoni, and some of them are much larger than the 
others ; the spines of the caracoid are not visible externally on 
specimens preserved in liquor. The scales of the body are 
smaller, and number about eighty-six on the longitudinal line, 
and forty-seven or forty-eight on the transverse one ; the fins 
are very similar in both sorts ; the caudal is more truncated in 
the Swan Kiver fish. 
The colour after having been in spirits, is very silvery ; 
some specimens have round black spots dispersed over the 
back and the head ; there is always a longitudinal band of 
the same colour below the eye ; the fins are reddish, with the 
caudal and the soft parts of the dorsal and anal covered with 
black rounded spots. In some specimens the pectorals have 
transverse obscure lines. 
THERAPON CAUDOVITTATUS. 
Datnia Caudovittata, Rich., Ereb. and Terror, Fishes, 
p. 24, pi. 18. 
Therapon Caudovittatus, Gunther, Gat., vol. i., p. 284. 
Body higher and rather shorter than in Richardsoni ; the 
height is three times and one-quarter in the total length ; the 
head is three times and two-thirds in the same, and the eye a 
little less than four times in the length of the head ; the 
upper profile is very convex, and extends regularly to the mouth ; 
the teeth are rather short and thick ; the praeorbital is finely 
denticulated ; the caracoid strongly denticulated ; the 
prseoperculum is rather strongly but regularly denticulated ; 
the scales are rather large and number about fifty-eight on the 
longitudinal line, and about twenty-eight on the transverse 
one, nine of these are above the lateral line. 
The dorsal is formed of thirteen slender spines ; the first 
four ones being shorter than the others, which become them- 
selves shorter as they are situated further back; the soft portion 
is rather short, but much higher than the last spines, of nine 
