The pike-perch or wall-eye was first described by Dr. Mitchill in 1818, from Cayuga Lake, New York. He named it _vitrea_ in allusion to its large vitreous or glassy eye. It would have been indeed fortunate if the name glass-eye or wall-eye, with or without the suffix perch, had been adopted; for this fine fish is a true perch, with nothing "pike-like" in form or habits, except its large mouth and canine teeth, and nothing "salmon-like" except its trimly-shaped body. But these fancied resemblances have caused it to be called in various localities wall-eyed pike, yellow pike, blue pike, glass-eyed pike, salmon, and jack salmon. It is also known in Canada as dorè and okow, and among the commercial fishermen as "pickerel." However, the names pike-perch and wall-eyed pike have been rather universally adopted, and it will probably be always known by these names. Pike-perch is the Anglicized form of _Lucioperca_, the Latin name of the genus in Europe. It is abundant in Canada and the Great Lake region, and fairly abundant in the upper Mississippi River and its tributaries, and especially in Lake Pepin. It is found also in the lake region of northern Minnesota, and in the lakes and streams of Wisconsin and Iowa. It is not uncommon in the upper Ohio River and tributaries, south to Tennessee. On the Atlantic slope it is more rarely found from Pennsylvania to Georgia, where it often exists in brackish water. I have taken it in my boyhood days at Ferry Bar, a point on the Patapsco River, near Baltimore. Maryland. Its range is being constantly extended by transplantation. The pike-perch is a very trimly-built and shapely fish. Its body is rather slender, not much compressed. The head is well shaped, neither too large nor too small, with a large mouth well filled with teeth, some quite long and sharp. The eye is very large and glassy. Like all the perches it has two dorsal fins, well separated; the caudal fin is forked. The scales are small and rough. The edge of the cheek-bone is toothed or serrated, and the edge of the gill-cover has one or more small spines. The color varies considerably in different localities, and even in the same waters. The usual color is olive, or greenish brown, mottled with brassy or yellowish blotches forming oblique but indistinct lines, or vermicular markings. The head is similarly colored and marked; the lower jaw is reddish; the belly and lower fins pinkish or yellowish; the first dorsal fin is not much marked, but has a large black blotch on its posterior border; the second dorsal fin is mottled with olive, brown, and yellow; the caudal fin is likewise mottled, with the tip of the lower lobe white or light colored.