THE FISHES OF NEW JERSEY. 207 
Pomotts aureus Abbott, Geol. N. J., 1868, p. 807. 
Eupomotis aureus Jordan, An. N. Y. Acad. Sci., I, 1879, p. 98. 
Family PERCIDZ. 
The Perches. 
Body more or less elongate, terete or compressed. Mouth 
terminal or inferior, small or large. Premaxillaries protractile 
or not. Maxillaries large or small, without distinct supplemental 
bone. Jaws, vomer and palatines with bands of teeth which are 
usually villiform, but sometimes mixed with canines. Occas- 
ionally teeth on vomer or palatines are absent. Preopercle en- 
tire or serrate. Opercles usually ending in a flat spine. Gills 4, 
a slit behind fourth. Gill-membranes free or connected, not 
joined to isthmus. Gill-rakers slender, toothed. Pseudobranchiz 
small, or glandular and concealed, or altogether wanting. 
Branchiostegals 6 or 7. Lower pharyngeals separate, with sharp 
teeth. Air-vessel small and adherent, often entirely wanting. 
Pyloric cceca few. Vertebrz 30 to 48, always more than Io, 
13 to 25 in precaudal portion. Body covered more or less com- 
pletely with rather small ctenoid adherent scales. Lateral line 
usually present, not extending on caudal fin. Head naked, or 
more or less scaly. Preopercle entire or serrate. Fins generally 
large. Dorsals 2, first of VI to XV spines. Anal fin with I to Il 
spines, usually latter. Caudal lunate, truncate or rounded. Pec- 
toral often very large. Ventral I, 5, thoracic. Anal papilla 
usually more or less developed. 
Fresh-water fishes of the temperate zone, several attaining 
some size and of value as food-fishes. 
Key to the genera. 
a. PerciIn#%. Pseudobranchie well developed; preopercle serrate; no canines. 
PERCA 
aa. ETHEOSTOMATIN®. Pseudobranchie imperfect or wanting; preopercle 
entire. 
b. Parietal region of skull rather depressed, not strongly convex in 
transverse section; —\-shaped in section. PERCINA 
bb. Parietal region of skull rather depressed, more or less strongly con- 
vex in cross-section, thus 
c. Cranium broad between eyes; snout projecting. BOLEOSOMA 
cc. Cranium narrow; snout not much protruded. BOLEICHTHYS 
