The Encyclopedia britannica; a dictionary of arts, sciences, and general literatureWith new maps, and original American articles by eminent writersWith American revisions and additions, bringing each volume up to date . t living represen-tatives, in South America. If, as we have seen, the term entomophagous isapplicable to most Inseciivora, much more so, on the otherhand, may the species of this great order be defined asphytophagous, and this uniformity in their food and in themode of obtaining it, namely, by gnawing, has evidentlyled to such corresponding general uniformity iu structure,,whic
The Encyclopedia britannica; a dictionary of arts, sciences, and general literatureWith new maps, and original American articles by eminent writersWith American revisions and additions, bringing each volume up to date . t living represen-tatives, in South America. If, as we have seen, the term entomophagous isapplicable to most Inseciivora, much more so, on the otherhand, may the species of this great order be defined asphytophagous, and this uniformity in their food and in themode of obtaining it, namely, by gnawing, has evidentlyled to such corresponding general uniformity iu structure,,which is observable throughout the species, that withdifficulty we obtain characters sufficiently salient for divid-ing them into genera and families. Although, like theInseciivora, they present much diversity of habit,— somebeing arboreal, as the Squirrels, many species of which areprovided with cutaneous parachutes on which they glidefront tree to tree; some cursorial, as the Hares ; some agilejumpers, as the Jerboas; some fossorial, as the great 5Io!e-Rats ; and some natatorial, as the EeaV3rs and Water-Eatg^—yet we do not find corresponding structural modificationscomparable with those noticed in that FiO. 83.—side View of Skull of Cape Ji- ? eaffer). x }. PMt. piemaxiUa; ; i^a. uialai ; / /, £]a,parietal jVa, nasal; Sq, Bquftmosnl ; Ty, -tympanic; , exwcipiiaf; AS, aUsphc&old;OS, orbito-sphcnotd; Per^ mastoid bulla. Flower, Osteol. Mantmat. The Kodent skull is characterized by the great size of thepremaxillary bones, which completely separate the nasak 41G :\1 A ]M ^1 A L I A Fr: from tlie maxiUaries, by the invariable presence ofzygomatic arclies, aud by the wide unoccupied space exist-ing botwenn the alveoli of the incisors and the molar teeth,and (except in Lagomorpha) by the anteroposteriorlyelongated glenoid cavity. Post-orbital processes of thefrontals exist only in the Squirrel*, Marmots, and Hares;in all other genera they are rudimentary o
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Keywords: ., bookauthorbaynesth, bookcentury1800, bookdecade1890, bookyear1892
