2 NORTHERN ZOOLOGY. 



Cuvier. The mistake of confounding the American perches with their European 

 representative is a very excusable one, where opportunities of comparison do not 

 exist ; and Baron Cuvier, after describing P. flavescens, P. serrato-granulata, and 

 P. granulata, which inhabit the Atlantic streams of New York and the neighbour- 

 ing States, adds " Ettes seraient certainement confondues avec le notre, par un 

 voyageur qui les observerait chacun isolement et sans pouvoir en faire, comme 

 nous, un rapprochement et une comparaison immediate." 



DESCRIPTION 

 Of a specimen taken at Penetanguishene, Lake Huron, May, 1825. 



Colour. — General tint of the back greenish-yellow ; of the sides golden-yellow with minute 

 black specks ; and of the belly whitish. Nine or ten dark bands descend from the back to 

 the sides, and taper away towards the belly ; the alternate ones are shorter, and on the tail 

 and shoulders they are less distinctly defined : the longest band is opposite to the posterior 

 part of the first dorsal fin, on which there is a large black mark. 



Form. — The body is moderately compressed, its greatest thickness being somewhat more 

 than one half of its depth. Its profile is oblong, tapering more towards the tail, which is 

 nearly cylindrical : its greatest depth is at the ventrals, and rather exceeds one-fourth of the 

 total length, caudal included. 



The head constitutes two-sevenths of the total length, and its height, at the eye, is equal 

 to one-half its length, from the tip of the snout to the point of the gill-cover. The forehead 

 is flat, but appears depressed, owing to the convexity of the nape. The snout is a little convex. 

 The orbits are lateral, distant more than one of their own diameters from the tip of the snout, 

 and more than two diameters from the point of the gill-cover. The jaws are equal. The 

 mouth descends as it runs backwards, its posterior angle being under the centre of the orbit. 



Teeth. — The intermaxillaries, lower-jaw, knob of the vomer, and edge of the palate-bones, 

 are covered with very small, straight or slightly-curved densely-crowded teeth (en velours). 

 The vault of the palate, posterior part of the vomer, and the pointed tongue, are smooth. 



Gill-covers. — The preoperculum is narrow ; its upper limb rising vertically forms a 

 right angle with the lower one ; and its edge is armed with small spinous teeth, those on the 

 lower limb being directed forwards. The bony operculum terminates in a narrow sub-spinous 

 point, beneath which there are three denticulations, with grooves running backwards from 

 them. An acute-pointed membranous flap prolonged from the margin of the suboperculum 

 conceals these parts in the recent fish. The edge of the interoperculum and posterior part 

 of the suboperculum are minutely denticulated. The edges of the humeral bones are slightly 

 grooved and denticulated, the denticulations being more obvious in some individuals than in 

 others. 



Scales. — There are sixty scales on the lateral line, and twenty-two in a vertical row between 

 the first dorsal and centre of the belly. The scales are rather small, their bases truncated 

 and furrowed to near the middle \striees en eventail) by six grooves corresponding to eight 

 minute lobes of the margin. A narrow border of the outer rounded edge is very minutely 



