OF AUSTRALIA. Ill 
half the length of the orbit ; the upper profile is very, and 
almost regularly, convex; the cheeks have five series of scales, 
and the operculum the same number ; this last has a well- 
marked point ; the lateral line runs over forty-seven scales, 
and is not visible on the very small ones of the end of the 
tail ; the transverse line has eighteen scales ; the lateral line 
passing over the sixth. 
The dorsal has eleven spines and as many rays ; the spines 
are thick and inflated on their back edge ; the first is short ; 
the second about twice as long • the third a little longer and 
the fourth the longest of all, and equal to one-half the length 
of the head ; the caudal is rather deeply forked, of seventeen 
long rays ; the anal has three spines and eight rays ; the first 
spine is very short, the second four times as long, and con- 
siderably longer than the fourth dorsal ; the third is very 
strong, almost straight, about one-fourth shorter than the 
second and not quite as long as the rays ; it is contained once 
and a half in the length of the head; the ventrals are 
large and extend to the snout ; the pectorals are long 
and have nearly once and one-third the length of the head, 
they are pointed and formed of sixteen rays. 
The total length is nine inches, and the colour uniform 
silvery, with the outer part of the dorsal, caudal, anal, and 
ventrals more obscure. 
DIACOPUS ADETII. 
The genus Diacopus of Cuvier is easily recognised amongst 
the Percidce, by the deep notch of the lower part of the 
praeoperculum, which receives a strong tubercule of the inter- 
operculum ; these fish have the general appearance of Sparidce. 
The name of the genus has been changed by Dr. Gunther 
into Genyoroge, employed by Dr. Cantor for one of its sorts, 
but all other authors have adopted the name given by the 
great French naturalist. 
The sort I here describe appears very distinct from the three 
or four others which have eleven spines at the anal, and 
which are all adorned with bands or stripes, which this does 
not possess. 
