. A manual of zoology. 540 MANUAL OF ZOOLOGY at their bases ; or relatively short and blunt, when they are incompletely or not at all retractile. The otters {Lutra) differ from the rest in having short limbs with the toes connected by webs of skin. The Pinnipedia, or seals and walruses (Fig. 326), have the proximal segments of the limbs short, so that the arm and thigh and nearly all the fore-arm and leg are enclosed in the common integument of the trunk, and the manus and pes elongated. The earless seals {Phocidcz) are much more completely adapted to an aquatic life than the eared seals. Fig.
. A manual of zoology. 540 MANUAL OF ZOOLOGY at their bases ; or relatively short and blunt, when they are incompletely or not at all retractile. The otters {Lutra) differ from the rest in having short limbs with the toes connected by webs of skin. The Pinnipedia, or seals and walruses (Fig. 326), have the proximal segments of the limbs short, so that the arm and thigh and nearly all the fore-arm and leg are enclosed in the common integument of the trunk, and the manus and pes elongated. The earless seals {Phocidcz) are much more completely adapted to an aquatic life than the eared seals. Fig. 326.— Harbor Seal {Phoca vitulina). ( Otariidce) and walruses (Trichechidtz), being unable to flex the thigh forwards under the body, so that the hind-limbs may aid in supporting the weight, and thus being only able to drag themselves along very awkwardly when on dry land. The pinna of the ear is absent in the earless seals and walruses, well developed in the eared seals. The surface in all is covered with a thick soft fur. In the fur seals there are two kinds of hairs, those of the one kind being longer and coarser and scattered through the more numerous shorter and finer hairs composing the fur proper. A remarkable. 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 Parker, T. Jeffery (Thomas Jeffery), 1850-1897; Haswell, William A. (William Aitcheson), 1854-1925. New York, The Macmillan Company; London, Macmillan & Co. ,Ltd.
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