Frank Forester's fish and fishing of the United States and British provinces of North America . fidly aspired to the honours of a naturalist ;and has most deservedly ac(piircd, as such, no small degree ofcelebrity and favour. From this sljort excursion, into which 1 have been naturallyled in the course of my subject, I return to the description ofthe gill-covers of fish, and thereafter to the dental system, themethod of comparing which I shall lay down briefly for the useof the learner, and then proceed at once to the history ofSporting Fislies. The subject, which I now present, is the head of
Frank Forester's fish and fishing of the United States and British provinces of North America . fidly aspired to the honours of a naturalist ;and has most deservedly ac(piircd, as such, no small degree ofcelebrity and favour. From this sljort excursion, into which 1 have been naturallyled in the course of my subject, I return to the description ofthe gill-covers of fish, and thereafter to the dental system, themethod of comparing which I shall lay down briefly for the useof the learner, and then proceed at once to the history ofSporting Fislies. The subject, which I now present, is the head of the SilverTrout of Europe {Sa/mo I^iriijitris), n 8i)ccic« found in the largelakes of that continent. The figure is copied, by permission,fn)m Professor Agnssin great work <»n the Fresh-water Fishesof Centml Kunipo. Tlie gill-covers of all the fishes of the three first divisions. 48 SALMONIDiE. with which alone we have to do, consist of four principal parts,and their use is to close the aperture behind the gills, which inall these three divisions is so formed, and so freely or loosely. suspended, that the water bathes in its passage every part oftheir surface. These parts are, the pre-operculum, or fore-gill-cover, No. 1;the operculum, or gill-cover proper, No. 2 ; the sub-opercidum,or under-gill-cover. No. 3 ; and the inter-operculum, or inter-mediate gill-cover. No. 4. The branchiostegous rays, as they aretermed, are indicated by No. 5 ; and the fixed plates, formingthe posterior immoveable margin of the gill-covers, by No. 7 indicates the pectoral fin. How widely these parts differ in form, in different species ofthe Salmon tribe, will become at once apparent by a comparisonbetween the gill-covers in the figure above, and those of thetrue Salmon { Salar), and the Bull Trout {Salmo Eriox),Nos. 2 and 3, in the following cut, which, Avith these, presentsa view of the interior of the mouth and the dental system of theCommon Trout {Salmo Fario), of Great Britain
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Keywords: ., bookcentury1800, bookdecade1840, bookidfran00kforestersfiherbric
