562 THE OCEAN WORLD, 
the other that the body is, as it were, enclosed in a kind of box or 
long coffer, which only leaves the external organs of locomotion 
exposed, namely, the pectoral, dorsal, and caudal fins. In some the 
body is triangular, in others quadrangular, with or without spines. 
Vig. 369.—The ‘lrunk-fish (Ostracion), Hl 
These singular fishes are generally of moderate size, and are found 
only in the seas of warm climates. 
IL—LoriioBRANCHIA, 
The Lophobranchiate sub- order comprehends but few genera which 
are pretty numerous in species. Here the gills are formed of small 
round tufts, and arranged in pairs along the branchial arches—a 
structure quite peculiar, of which we have no examples in any other 
fishes. These gills are enclosed under a large cover, or operculum, 
attached on all sides by a membrane, which leaves only a small hole 
for the escape of water which has served the purposes of respiration. 
Of these little cuirassed fishes the two best-known genera are 
Syngnathus and Hippocampus. The former, known as pipe-fishes, 
present a very curious snake-like outline. Their bodies are long, 
slender, and slightly tapering, covered with plates set lengthwise, 
