. Handbook of zoology with examples from Canadian species, recent and fossil [microform]. Zoology; Invertebrates; Zoologie; Invertébrés. I'KOVINXi: ARrilUOI'JDA. ISO It is to l)c ohscrved, however, with rcsj)cct to the rnnk of these classes, thai while the more i)erfe(t Ara( htiidu arc in some resperts hiL^her in niiik than the fnie insects, they also apjjroach in other re^peds more nearly lo ihe ('rustacea, and that while the lower Myriaixnls jiresent many resemblances to worms, tlu\ are ver\ mar to the Hcxapod Insects in the character of their respiration. Class I.—Crustacka. Body ivith arti
. Handbook of zoology with examples from Canadian species, recent and fossil [microform]. Zoology; Invertebrates; Zoologie; Invertébrés. I'KOVINXi: ARrilUOI'JDA. ISO It is to l)c ohscrved, however, with rcsj)cct to the rnnk of these classes, thai while the more i)erfe(t Ara( htiidu arc in some resperts hiL^her in niiik than the fnie insects, they also apjjroach in other re^peds more nearly lo ihe ('rustacea, and that while the lower Myriaixnls jiresent many resemblances to worms, tlu\ are ver\ mar to the Hcxapod Insects in the character of their respiration. Class I.—Crustacka. Body ivith articulated limbsy and divisUde into cephalo- thorax and abdomen. Respiratory ofgans branchial. Head li'ith jointed antenmc. The crustaceans are the soft shell-fishes, of which the Crab, Lobster, Crayfish and Shrimp, may be taken as examples. They are characterized by the division of the body into two portions, the cephalo-thoraxand abdomen, and by the possession of proper jointed limbs, raid j_ills as organs of respiration. By these characters they may be distinguished from the worms on the one iiand and. Fig. 238.—Diagram of a Dkcapod cri-stacean. Stomach. ^—Heart. f/—Gills. /— 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 Dawson, J. W. (John William), Sir, 1820-1899. Montreal : Dawson
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