IS IT A MACKEREL ? 97 
dull silvery sheen on the sides of the body and on the sides 
and lower parts of the head. Fins: pectoral, greenish-black, 
first dorsal likewise; the membrane washed over with greyish. 
Anal fin with the forepart (edge) greenish-blue, the rest of 
the fin greyish-white, dusted over with darker. Ventral, 
somewhat similar to anal. Caudal, greenish-black,— not 
uniformly so, however, as there was a tendency for a little 
dirty grey to show through in parts. Finlets, of a bright 
orange, edged with greenish-black. fae 
I might add that a very fine cast was made of this 
magnificent specimen at the Technological Museum, Sydney, 
where it now is. This cast was nicely colored under my 
observation. 
Frigate Mackerel (Awzis thazard). 
During 1903, and towards the latter end of last year, 
small shoals of this species made their appearance in the 
waters of Port Jackson. They were from 12 to 15 inches in 
length. As this widely-distributed fish usually roams about 
in large shoals, it is highly probable that they were present 
in considerable quantities in the vicinity of Port Jackson. 
When freshly taken, these examples had the appearance 
of polished lead, and they appeared to be familiar to some of 
the Sydney fishermen, who called them ‘“ Leadenalls.” 
Butterfly-Fish (Gasterochisma melampus). 
Prate LXV. 
First recorded by me from these waters last year, the 
record being based upon two examples captured a short 
distance to the southward of Sydney, at the latter end of 
August, 1906. The larger of these two measured 16 inches. 
This remarkable fish is a rather aberrant form of Mackerel. 
Its body is highly compressed or slab-sided, suggesting that 
of the Tailer. The ventral fins are exceedingly large and 
fan-like. The scales are of moderate size, thin and deciduous, 
and are concentrically striated. 
