. Text-book de zoologie pour les écoles et collèges. Zoologie. 312 ANIMAUX VERTÉBRÉS. voler, mais, comme le "vol" Phalangers, ils longtemps saute d'arbre en arbre au moyen d'étendre latéralement-replis de peau. Les marmottes, contrairement aux écureuils typiques, sont des animaux, et vivre dans des terriers. Un excellent exemple est offerte par le chien de prairie-{Arctomys Ludovicianus) d'Amérique du Nord. Oedee XI. CJieir Cheieopteea (Gr., la main ; pteron, aile). -Cet ordre est imdoubtedly l'un des plus naturels et dis-. FiG, 167.-squelette d'un bat (^PUropus.) (Après Owen.) tinctly circonscrite dans les commandes e

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. Text-book of zoology for schools and colleges. Zoology. 312 VERTEBRATE ANIMALS. fly, but, like the "flying" Phalangers, they take long leaps from tree to tree by means of laterally-extended folds of skin. The Marmots, unlike the typical Squirrels, are ground-animals, and live in burrows. An excellent example is afforded by the Prairie-dog {Arctomys Ludovicianus) of North America. Oedee XI. Cheieopteea (Gr. cJieir, hand; pteron, wing). —This order is imdoubtedly one of the most natural and dis-. FiG, 167.—Skeleton of a Bat (^PUropus.) (After Owen.) tinctly circumscribed orders in the whole class of the Mam- malia, comprising only the Bats. In many respects, however, it might be well to regard the order as merely a modified branch of the Insectivora, just as the Pinnigrada are regard- ed as a modified offshoot of the Camivora. The Cheiroptera or Bats are essentially characterized by the fact that the fore- limbs are much longer than the hind-limbs, and have several of the fingers enormously elongated. These enormously length- ened digits are united by an expanded leathery membrane or " patagium, " which not only stretches between the fingers, but is also extended between the fore and hind limbs, and is attached to the sides of the body (Fig. 157). The patagium. 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 work.. Nicholson, Henry Alleyne, 1844-1899. New York, D. Appleton and Co.

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