ACANTHOPTERYGII. 
Famity—PERCID. 
PeRcA L&VIS. Jen. 
Puate I. 
P. nigricanti-fusco undique punctata ; vertice, fronte, rostro usque ad nares, et infra- 
orbitalium parte posteriort, squamatis ; squamis, in capite ciliatis scabris, in corpore 
sublevibus. 
Bi7: Ds 9=W11s As 3/08 Crt7 =P. 155° V. 1/5. 
Lone. une. 11; lin. 5. 
Form.—Much more elongated than the common Perch, with the back less elevated. Depth, 
beneath the commencement of the first dorsal, not quite equalling one-fifth of the entire length. 
Thickness, in the region of the pectorals, about two-thirds of the depth. Head not quite 
one-fourth of the entire length. Profile falling gently from the nape in nearly a straight line 
at an angle of about 45°: at the nape the dorsal line rises so as to interrupt its continuity 
with the slope of the profile, but it is nearly horizontal along the base of the dorsal fins. The 
jaws are nearly equal, but when the mouth is closed, the upper one appears somewhat the 
longer. A band of velutine teeth in each jaw, as well as on the vomer and palatines. Maxil- 
laries when at rest nearly concealed beneath the:suborbital bones: these last with their lower 
margin distinctly denticulated ; their surface presenting several small hollows. Eyes rather 
above the middle of the cheeks, and about equi-distant from the extremity of the snout and the 
posterior margin of the preopercle ; their diameter is one-sixth of the length of the head ; the dis- 
tance from one to the other equals one diameter and ahalf. Nostrils double, a little in advance of 
the eyes; the first orifice oval, the second round. Preopercle rectangular, with the angle rounded ; 
B 
