. Preliminary report on the fish and fisheries of Ontario [microform]. Fishes; Fisheries; Poissons; Pêche commerciale. NATURAL HISTORY OF ONTARIO FISH. t The Class of the Fishes is divided by zoolo/i^fists into six sub-classes, con- taining :— I. Tlie Lancelet or Ampliioxus. II. The Lampreys and Hag-fishes. III. The Sharks and Kays. IV. The Ganoid Fishes. V. The Teleost or Bony Fishes. Yl. The Dipnoi or Lung-Fishes. Of .'ihese the 1st and 3rd are not represented in fresh waters, and need not concern us here. With few exceptions our fish belong to the fifth sub-class. Sub-class II.—Cyclostomi,
. Preliminary report on the fish and fisheries of Ontario [microform]. Fishes; Fisheries; Poissons; Pêche commerciale. NATURAL HISTORY OF ONTARIO FISH. t The Class of the Fishes is divided by zoolo/i^fists into six sub-classes, con- taining :— I. Tlie Lancelet or Ampliioxus. II. The Lampreys and Hag-fishes. III. The Sharks and Kays. IV. The Ganoid Fishes. V. The Teleost or Bony Fishes. Yl. The Dipnoi or Lung-Fishes. Of .'ihese the 1st and 3rd are not represented in fresh waters, and need not concern us here. With few exceptions our fish belong to the fifth sub-class. Sub-class II.—Cyclostomi, The fishes that belong to this group ore eel-like forms of parasitic habits, attaching themselves by means of their circular mouths to larger fish, of which they suck the blood. Their skeleton differs very much from that of other fish : it consists of a brain-case formed of cartilage, supports for the gills of the same material, and a notochord running underneath the spinal cord. There are no true jaws, nor limbs, nor ribs as in other fish. One of the families— the Myxinidae—is entirely marine, the other—the Petromyzontidse—has some fresh-water species. They are at once recognized by the circular sucking-mouth (fig. 11), the horny teeth within it, the single nostril on the t <p of the head, and the separate openings of the seven gill-pouches on each side ol the Fig. 11.—Mouth OF River Lamprey. {Petromyzon eoncolor.) The only species in Ontario waters is Petromyzon coTieolor, the Silvery Lamprey, a small species of no economic importance found in the Great Lakes and living partly as a parasite of the lake Sturgeon, to which it attaches itself and forms. 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 may not perfectly resemble the original Wright, R. Ramsay (Robert Ramsay), 1852-1933. [Toronto? : s. n. ]
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectfi, booksubjectfishes
