. Handbook of zoology with examples from Canadian species, recent and fossil [microform]. Zoology; Invertebrates; Zoologie; Invertébrés. LEATMNf; nrVISIOXS OF 0() To these ])rovinces nearly all animals can readily be referred, 'i'hosc whose positi(jii is doubtful we shall have to notice as we proceed. 'i'he seven primary groups above mentioned may be defmed as follows :— t 1. including Mammals, IJirds, Rejjtiles, Amphibians and Fishes. All these animals are bilateral and symmetrical, have an internal vertebrate skeleton, a brain and a dorsal nerve-cord lodged in a specia
. Handbook of zoology with examples from Canadian species, recent and fossil [microform]. Zoology; Invertebrates; Zoologie; Invertébrés. LEATMNf; nrVISIOXS OF 0() To these ])rovinces nearly all animals can readily be referred, 'i'hosc whose positi(jii is doubtful we shall have to notice as we proceed. 'i'he seven primary groups above mentioned may be defmed as follows :— t 1. including Mammals, IJirds, Rejjtiles, Amphibians and Fishes. All these animals are bilateral and symmetrical, have an internal vertebrate skeleton, a brain and a dorsal nerve-cord lodged in a special cavity of the skeleton. With reference to their general form, they may be termed doubly symmetrical animals ; with reference to their nervous system, Myelencephalous, (Fig. 17.). 2. Arthroimda. including Insects, Myriapods, Arachnida, or spiders and scorpions, and Crustaceans. These animals are bilateral and symmetrical, with the body divided into unequal segments, and provided with jointed limbs. They have an external annulose skeleton, and a nervous V*. 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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Keywords: ., bookcentury1800, bookdecade1880, booksubjecti, booksubjectzoology
