958 FISHES — PERCID^. 



g. Gill-membranes more or less broadly united ; belly with ordinary scales. 

 h. Lateral line complete ; maxillary adnate to the preorbital. 



DlPLKSIUM. 



gg. Gill-membranes scarcely nuited ; anal as large as second dorsal, 

 i. Belly, with enlarged caducous plates. . . Cottogastek, 



ii. Belly without enlarged plates, anteriorly naked, posteriorly scaled 

 like the sides. ....... Imostoma. 



CO. Premaxillaries not protractile. 

 j. Lateral line complete. 



fc. Ventral line with a series of enlarged, spinous, caducous scales^ 

 or if these are fallen, a naked strip. 



I. Mouth small, inferior, beneath a pig-like snout. . . Pekcina. 



II. Mouth larger, the snout not projecting beyond it. 



Alvokdius, 

 Tele. Ventral line without caducous scales 



m. Gill-membranes scarcely connected. . . Nothonotus. 



mm. Gill-membranes broadly connected. . . Nanostoma. 

 jj. Lateral line present, incomplete. 



m. Gill-membranes broadly united. . . . Etheostoma. 



nn. Gill-membranes separate, or nearly so. . . Pcbcllichthts, 



jjj. Lateral line obsolete. . . ... Mickoperca. 



Genus 69. PERCA. Linnaeus. 



Perca, LiNNiEUS, Syetema naturce. Ed. x., 1858. 



Type, Perca flnviatilie L. 



Etymology, Latin, Perca, a perch ; Greek, perche, fvom perchos, dusky. 



Body elongate, fusiform, somewhat compressed ; head conical ; its sides mostly scaly f 

 the operculum chiefly naked and rough-striate, armed with a single spine ; preoperculum 

 scapular and oaraooid bones serrated; month moderate; teeth all in villiform bands ;^ 

 dorsal fins not connected, the first with about thirteen spines ; anal with two slender 

 spines ; caudal forked ; scales small, rough ; lateral line complete ; pyloric coeoa 3 ; ver- 

 tebrae 21-20. 



129. Perca Americana Schranck. 



Yellow Perch; Ringed Perch; Common Perch. 



Perca amerioana, Schranck, 17, fide Gill.— Jokdan and Gilbert, Klippart's Eeport Fish 



Commr. Ohio, 1877, G5.— Jordan, Man. Vert., 3d Ed., 1878. 

 Perca fluviaiilis, var. americana, Steindachnbr, Bntrage, 1677. 

 Bodianus flavescens, Mitchill, Ph. Trans, N. Y., 1815, i, 421. 

 Ceniropomua luteus, Eafinesqdk, Precis des Dicouvertea Somiologiqves, 1814, 19. 

 Perca flavescens, Cuvier, Regno Animal, 1817. — Cuv. and Val., Hist. Nat. des Poissons, 



ii, 1828, 46. — Richardson, Fauna Bor-Amer., Fishes, 1836, 74. — DeICat, Nat. Hist. 



N. Y., Fishes, 1842, 3,— Storer, Synopsis, 1846, 17.— Kirtland, Bost. Jonrn. Nat. 



Hist., V, 1847, 337.— Agassiz, Lake Superior, 1850, 291.— Gunther, Cat. Fishes, Brit. 



Mus., i, 59, 1859.— HoiBROOK, Ich. S. Car., I860.— Storer, Hist. Fishes Mass., 1867.— 



Jordan, Man. Vert., 1876, and of authors generally. 



