II. JUGULAR Have bony gills; and the ventral fins situated in front of
the pectoral fins, as the _cod_, _haddock_, and _whiting_.
III. THORAIC Have bony gills; and the ventral fins situated directly
under the pectoral fins, as the _perch_ and _mackerel_.
IV. ABDOMINAL Have bony gills; and the ventral fins on the belly behind
the pectoral fins, as the _salmon_, _herrings_, and _carp_.