. Les poissons. Les poissons. L'Arctique et de l'Éperlan 345 la septentrionale (signifcr) ; mais la constance de ces caractères dans les spécimens du locahties intermédiaire n'est pas encore prouvé. Une autre forme très semblable, appelé Thymallns montaniis, se produit dans la Gallatin, ]Iadison, et d'autres rivières de l'ouest du Montana affluent de la Missouri. C'est encore abondante localement et l'un des plus beaux de jeu-poissons. Il est probable que l'ombre de l'avait autrefois un éventail plus au sud qu'aujourd'hui, et qu'en ce qui concerne les eaux territoriales américaines sont concernées, il s'oriente vers l'extinction. Cette tendance est,

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. Fishes. Fishes. The Grayling and the Smelt 345 the northern form (signifcr); but the constancy of these charac- ters in specimens from intermediate locahties is yet to be proved. Another very similar form, called Thymallns montaniis, occurs in the Gallatin, ]Iadison, and other rivers of Western Montana tributary to the Missouri. It is locally still abundant and one of the finest of game-fishes. It is probable that the grayling once had a wider range to the southward than now, and that so far as the waters of the United States are concerned it is tending toward extinction. This tendency is, of course, being. Fig. 250 -Michigan Grayling, Thymall-:s tricolor Cope. Au Sable River, Mich. accelerated in Michigan by lumbermen and anglers. The colonies of grayling in Michigan and Montana are probably remains of a post-glacial fauna. The Argentinidse.—The family of Argcntinidcr, or smelt, is very closely related to the Salmonidcr, representing a dwarf series of similar type. The chief essential difference lies in the form of the stomach, which is a blind sac, the two openings near together, and about the second or pyloric opening there are few if any pyloric ca;ca. In all the Sahnonida; the stomach has the form of a siphon, and about the pylorus there are very many pyloric cseca. The smelt have the adipose fin and the gen- eral structure of the salmon. All the species are small in size, and most of them are strictly marine, though some of them ascend the rivers to spawn, just as salmon do, but not going very far. A few kinds become land-locked in ponds, ilost of the species are confined to the north temperate zone, and a few sink into the deep seas. All that are sufficiently abundant furnish excellent food, the flesh being extremely delicate and often charged with a fragrant oil easy of digestion.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations

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