...The incisor teeth arenever more than six in number, which is the maximum throughoutplacental mammalia (as opposed by marsupial), and in severalinstances one or two pairs are deficient... 
Robert A. Sterndale 「Natural History of the Mammalia of India and Ceylon」
...The other sub-order, the genera of which have rudimentary incisors,as in the case of hares, rabbits, &c...
Robert A. Sterndale 「Natural History of the Mammalia of India and Ceylon」
...Ro' dent, mammals with curved self-sharpening incisor teeth, order includingmice, rats, squirrels, rabbits, etc...
Worrallo Whitney 「A Guide for the Study of Animals」
...californicus, east of the Rocky Mountains, has abifurcation, or even trifurcation, of the infold that can readily beseen by examining the occlusal surface of the incisor...
E. Raymond Hall 「A Synopsis of the North American Lagomorpha」
...The exposed incisor teeth, the short head and upturned nostrils, give these cattle the most ludicrous, self-confident air of defiance...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
...The incisor teeth, or nippers...
Robert Jennings 「Sheep, Swine, and Poultry」
...Strands of beads, used either for an ear pendant or for ornaments atthe peak of a hood, have a caribou incisor fastened at the tip...
Francis Harper 「The Barren Ground Caribou of Keewatin」
...Aging white-tailed deer byannuli in the cementum of the first incisor...
L. David Mech 「Ecological Studies of the Timber Wolf in Northeastern Minnesota」
...sawrockensis differs in: incisor less procumbent;masseteric ridge extending farther anteriorly; anterior cingulum of m2 slightlylarger...
Robert L. Packard 「Speciation and Evolution of the Pygmy Mice, Genus Baiomys」
...kolbi differs in: molar row longer; m3 larger; jawlarger; diastema not so acutely curved; incisor shorter, narrower transversely,more proödont...
Robert L. Packard 「Speciation and Evolution of the Pygmy Mice, Genus Baiomys」
...brachygnathus differs in: incisor more slender, shorter,more proödont; diastema shorter...
Robert L. Packard 「Speciation and Evolution of the Pygmy Mice, Genus Baiomys」
...We come now to the second sub-order of theRodents or animals that gnaw, the Duplicidentati,the rodents having four incisor teeth in the upper jaw...
Various 「Natural History in Anecdote」
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