. Commissioners' Game and game-birds; Game protection; Fisheries; Fishes. 434 The vertebral column is formed of vertebrae, each of which has a rounded body hollowed out on both faces (amphicoelous), from which there projects an upper arch protecting the spinal cord and terminating above in an upper or neural spinous process (fig. 6). Between the neural spines are inter-spinous bones which. Fig. 6.—Caudal Vertebra and Caudal end of Vebtebral Column in the Catfish. Ns, neural spine ; c, vertebral centre ; hs, haemal spine; nsh, bony sheath of the notochord ; cr, caudal rays. carry the f
. Commissioners' Game and game-birds; Game protection; Fisheries; Fishes. 434 The vertebral column is formed of vertebrae, each of which has a rounded body hollowed out on both faces (amphicoelous), from which there projects an upper arch protecting the spinal cord and terminating above in an upper or neural spinous process (fig. 6). Between the neural spines are inter-spinous bones which. Fig. 6.—Caudal Vertebra and Caudal end of Vebtebral Column in the Catfish. Ns, neural spine ; c, vertebral centre ; hs, haemal spine; nsh, bony sheath of the notochord ; cr, caudal rays. carry the fin-rays of the unpaired fins. In the tail region there are also ventral arches and spines which protect the blood-vessels running to the tail, and the ribs further forward in the trunk region correspond to these, although they do not meet in the middle line below. The caudal fin of the catfish appears quite symmetrical, and in some species (plate 5), is equally forked ; a close inspection of the skeleton, however, shows that it is chiefly situated on the lower surface of its axis, which is here abruptly turned up. This apparent symmetry (homocercal condition) is absent in some fish like the Sturgeon, (plate 1), where the vertebral column turns up, sub-dividing the tail very plainly into two unequal lobes (heterocercal condition). In the catfish some anterior vertebrae are united very intimately to each other, and to the skull and pectoral arch, in consequence of certain peculiar connections between the ears and the air-bladder, but this is not usual in 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
