. The chordates. Chordata. 736 Comparative Morphology of Chordates Subclass III. Placentalia Order 4: INSECTIYORA. Small, including the smallest of mam- mals. Notably lacking in highly specialized characteristics except in some arboreal or burrowing species. Dentition complete, but teeth of the several types not strongly differentiated from one another: mainly insect-feeding. Usually five digits on each foot; digits bear claws; loco- motion plantigrade. Uterus bicornis. Cerebral cortex smooth. Examples: Shrew (Sorex); tree shrew (Tupaia); mole (Talpa); hedgehog (Erinaceus), with a protective c
. The chordates. Chordata. 736 Comparative Morphology of Chordates Subclass III. Placentalia Order 4: INSECTIYORA. Small, including the smallest of mam- mals. Notably lacking in highly specialized characteristics except in some arboreal or burrowing species. Dentition complete, but teeth of the several types not strongly differentiated from one another: mainly insect-feeding. Usually five digits on each foot; digits bear claws; loco- motion plantigrade. Uterus bicornis. Cerebral cortex smooth. Examples: Shrew (Sorex); tree shrew (Tupaia); mole (Talpa); hedgehog (Erinaceus), with a protective coat of sharp spines re- sembling those of the porcupine, a rodent: (Figs. 543-545). Distribution: Both Eastern and Western Hemispheres, but not in South America and not in Australia, New Zealand, and adjacent islands. The hedgehogs occur only in the Eastern Hemisphere. Order 5: DERMOPTERA. Arboreal mammals having, on each side of the body, a broad fold of skin extending from the neck to the forelimb, from fore- to hindlimb, and behind hindlimb to tail (Fig. 546). The feet, with digits webbed, project freely beyond the edge of the fold. By spreading the "flying" membranes, the animal is enabled to make long sailing leaps. The brain is of primitive type. In general anatomy these animals resemble insectivores and also the more primi- tive primates (lemurs). This Order contains only the "flying lemur," or colugo, Galeo- pithecus, of the East Fig. 543. Common shrew. Sorex vulgaris, (Courtesy, Flower and Lydekker: "Intro- duction to the Study of Mammals," London, A. & C. Black. Ltd.). 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 Rand, Herbert W. (Herbert Wilbur), 1872-1960. Philadelphia : Blakiston
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