. Commissioners' Game and game-birds; Game protection; Fisheries; Fishes. NATURAL HISTORY OV ONTARIO FISH The Class of the Fishes is divided by zoologists into six sub-classes, con- taining :— I. The Lancelet or Amphioxus. II. The Lampreys and Hag-fishes. III. The Sharks and Rays. IV. The Ganoid Fishes. V. The Teleost or Bony Fishes. VI. The Dipnoi or Lung-Fishes. Of these the 1st and ord 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 are eel-l
. Commissioners' Game and game-birds; Game protection; Fisheries; Fishes. NATURAL HISTORY OV ONTARIO FISH The Class of the Fishes is divided by zoologists into six sub-classes, con- taining :— I. The Lancelet or Amphioxus. II. The Lampreys and Hag-fishes. III. The Sharks and Rays. IV. The Ganoid Fishes. V. The Teleost or Bony Fishes. VI. The Dipnoi or Lung-Fishes. Of these the 1st and ord 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 are 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 Myxinidge—is entirely marine, the other—the Petromyzontidie—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 top of the head, and the separate openiucrs of the seven gill-pouches on each side of the Fig. 11.—Mouth of River Lamprey. [Petromyzon concolor.) The only species in Ontario waters is Petromyzon concolor, 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 439. 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 Ontario. Game and Fish Toronto : Printed by Warwick
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectfi, booksubjectfishes
