ACANTHOPTERYGII. 
293 
THE FIRST FAMILY OF THE ACANTHOPTERYGII. 
Percid^ (the Perch Family). 
These fishes have the body oblong, covered with hard or rough scales, with the gill-lid or gill-flap, or 
often both, toothed or spinous in the margins. The species are very numerous in the waters of all 
warm countries ; their flesh is in general agreeable and wholesome ; they are mostly thoracic, or have 
the ventral fins under the pectoral, and they are subdivided according to the number of gill rays. 
The first division have seven rays in the gills, two dorsal fins, and all their teeth are velvety. 
[Cuvier makes use of this expression as descriptive of very minute teeth, set closely together 
in numerous rows, and thus resembling the pile of velvet in arrangement though not in texture.] 
This division comprises various species, of which the following are the principal genera : — 
Perea, including the Common Perch of Europe, and various other species of North America and other places ; 
Labrax, the Basse, a marine genus, of which species are found both in Europe and in America ; Bates, the Perch 
I of the Nile, of which there are also species in the Indian rivers ; Centropomus, the Sea Pike, which has the oper- 
culum obtuse and without spines ; Grammistis, an Indian genus, with white longitudinal stripes, and a black 
ground ; Arpro, the River Perch, found chiefly in the Rhine ; Zingel, a peculiar Perch of the Danube, with thirteen 
spines in the first dorsal. 
This subdivision also comprehends some fishes of foreign countries, whose peculiarities cause several subgenera. 
These are, Huro, like a true Perch, only the pre-operculum is not toothed ; Etelis, with hooked teeth in the jaws, 
but not in the palate ; NipJion, with strong spines on the pre-operculum and operculum ; Enoplosus, like a Perch, 
but with body much compressed, two high dorsals, and the pre-operculum deeply toothed ; Biplorion, compressed, 
double-toothed border to the pre -operculum, and two spines on the gill-lid. Other species of this subdivision are, 
Apogon, small fishes, of a red colour, with two dorsals far apart, and large scales, easily separated. One of them, 
the King of the Mullets, or Beardless Mullet, is found in the Mediterranean ; Clieilodipterus, resembling the former, 
but with long teeth in the jaws; and Poviatomus, a very rare genus, of small size, with immense eyes, and 
exceedingly small teeth, velvety in their arrangement. 
A second subdivision have two dorsal fins, hut long and pointed teeth, mingled with a velvety 
arrangement. 
Of these the principal genera are Ambassis, with the dorsals near each other, and a spine in front of the former ; 
they are small fishes of the warm regions of the East, abundant in pools and rivulets, and sometimes prepared as 
Anchovies ; and Lticio-perca, the Perch-Pike, with long teeth on the maxillaries, and and also in the palate, found 
in Eastern Europe. 
The second division of the Perches have seven rays in the gills, but only one dorsal fin ; the genera 
are arranged by the characters of their teeth, and the leading ones are these 
Serranus, the Sea Perch ; Antliias, the Barber, a beautiful red fish of the Mediterranean, with metallic reflec- 
tions ; Merous, the Great Perch, and some varieties. 
Distinct from these are several genera, Plectrepoma, Diacopus, Mesoprion, Acerina, Rypticiis, Polyprion, 
Centropristis, and Gristes. These inhabit ditferent parts of the world, and some of them are beautiful fishes. 
The Percidse with less than seven gill-rays, are arranged according to the number of their dorsal 
fins and the characters of their teeth. 
With a single dorsal, some have hooked teeth among the other ones, as Cirrhites, which inhabit the Indian 
Ocean, and have six gill-rays. Others have only small teeth, among which there are the following genera, CMro^ 
nemus, Pomotis, Centrackus, Priarcanthus, Dales, Therapon, Palates, and Elotes. These are chiefly fishes of the 
warm countries, some of the fresh water and others of the sea ; their colour is in general silvery, marked with 
blackish longitudinal lines. 
There are two genera of Percidse which have less than six gill-rays and two dorsals. 
These genera are Trichodon, a native of the North Pacific ; and Sillago, found in the Indian Ocean. One of 
the latter is supposed to be the finest fish in India. 
We now' pass on to other Percidse, which have more than seven gill-rays, and seven soft rays besides 
a spine in their ventrals, the other Jeanthopterygii having never more than five soft rays. 
The genera, Holocentrum, Myripristis, Beryx, and Traehichthys, all of which are brilliant fishes of the warm 
seas, and some have the air-vessel divided into two parts. 
All the Percidse hitherto mentioned have the ventrals immediately under the pectorals ; but there 
are others which have them differently placed. 
The Jugular Percidse have the ventrals upon the throat farther forward than the pectorals. They 
comprehend the following genera : — 
Trachinus, the Weavers, with the head compressed, the eyes near each other, the mouth obliquely up- 
