A POPULAR MISNOMER,. 8I 
BLACK TREVALLY. 
Black Trevally (Scganus nebulosus). 
Prate XLIX. 
This is not related to the true Trevallies belonging to 
the Yellowtail family. The popular name is, therefore, as in 
a number of other cases, decidedly misleading. Though fre- 
quently not to be seen in the markets for months at a time, 
large shoals occasionally appear in Port Jackson and the 
waters in the neighborhood, when comparatively small 
quantities are captured and brought in for sale. Not being 
recognised as a choice fish, and being usually of small size, 
it does not command a high price, though finding a ready 
sale. 
The family of fishes to which this one belongs is essentially 
a somewhat tropical one, and in the present instance, the 
species is found to be more abundant as we proceed in a 
northerly direction. 
The Black Trevally attains a length of about ro inches. 
A closely allied fish, known as Siganus javus, and which 
is commonly classed with the Black Trevally just mentioned, 
also occurs on our coast. It is very similar in structure and 
habits to the latter. : 
THE POMACENTRIDS. 
Sealyfin (Parma microlepis). 
PRAT E) Le. 
This is the only one of the New South Wales Pomacentrids 
which at present merits any attention as an edible fish. It 
is a small fish, attaining commonly a length of about 8 inches, 
and is found swarming around our rocky shores in great 
numbers. It can hardly be recognised as a market fish, 
although odd examples are to be seen Bian eats in 
with the products of the trammel-net 
