NATURAL HISTORY. 
47 
ROOM XI.] 
all the vertebrated animals, in having both eyes placed on 
one side of the head, which side is always uppermost when 
the fish swims, and strongly coloured, whilst the other is 
white. The body is compressed, fringed above by a long 
dorsal, and below by an anal fin. They live constantly in 
shallow water, near the shore. They are liable to varieties; 
sometimes both the upperandundersidearedark-coloured, 
and at others both are pale rosy white. When both the 
sides are brown, the fins are interrupted over the forehead, 
and the eyes are placed one on each side of the head of the 
fish. These fish have been divided into several genera, 
according to the length of the dorsal, and the distinctness 
of the pectoral fins. Some, as the Zebra So \e (Plagusia), 
are entirely without pectoral fins, and have the anal, 
caudal, and dorsal united into one. 
The third family of this division are the Suckers (Cy- 
clopteridce), so called from the pectoral fins being united 
♦ together into a disc, by which they attach themselves to 
marine bodies. Their skin is slimy and naked, or with 
hard grains embedded in it. The pectoral fins are large. 
They live in shallow water, near coasts, and swim with 
great vivacity. 
The Remorse ( Echeneisidce ) form the last family of the 
soft-finned, subbrachian fishes. They are known by the 
top of the head being flattened, and furnished with trans¬ 
verse series of cartilaginous plates, (somewhat similar 
to the plates under the toes of the Gecko,) by which these 
fish attach themselves to ships, rocks, and marine bodies. 
The second group of soft-finned fish consists of those 
vrhich have no ventral fins (Apoda). The first family of 
these are the Eels ( Murcenidce ), which have a long slender 
body, covered with small scales sunk into a thick slimy 
skin. Their gill-flaps are small, surrounded by the gill- 
rays, and covered with the skin, leaving merely a small 
tubular opening for the emission of the water. This struc¬ 
ture enables the fish to live a long time out of water. 
They have been divided into several genera, according to 
the teeth and the proportion of the fins. In most of the 
species, the dorsal and anal fins are long and united toge¬ 
ther ; in others they are short and quite separate ( Morin - 
guo ); and in some they are entirely wanting. In 
