. On the anatomy of vertebrates [electronic resource] . to be absorbed rather than shed. The deciduous incisors arefurther advanced before their displacement, and present the formof equal-sized dentinal spicula, tipped with enamel, attached bythe opposite end to the gum, and not exceeding ^-th of an inchin length; the number of the uterine series of teeth is In the volant Insectivora, or Bats, the canines are alwayspresent in both jaws, of the normal form, and with slightlyvariable proportions. The molar series never exceeds -§:-§-, and isdivisible into premolars and true molars; the latter ar
. On the anatomy of vertebrates [electronic resource] . to be absorbed rather than shed. The deciduous incisors arefurther advanced before their displacement, and present the formof equal-sized dentinal spicula, tipped with enamel, attached bythe opposite end to the gum, and not exceeding ^-th of an inchin length; the number of the uterine series of teeth is In the volant Insectivora, or Bats, the canines are alwayspresent in both jaws, of the normal form, and with slightlyvariable proportions. The molar series never exceeds -§:-§-, and isdivisible into premolars and true molars; the latter are bristledwith sharp points in the great bulk of the Cheiroptera. The inci-sors are the most variable teeth; they may be entirely wanting, or be present in the numbers of \\ ^ gjj; they are always very small,and, in the upper jaw, commonly unequal, and separated by awide median vacancy. In the genus Cliilonycteris, the mid-incisors above and the outer ones below have the crown notched; the mid-incisors below have twoon the cutting border. Taking 245. notches, producing three lobesthe common simple-nosed Bat(Vespertilio murinus) as atype of this Insectivorousgroup, we find its dentalformula to be— oo——= . *3^3; CTa,P373 In the leaf-nosed Bats(Phyllostoma, fig. 245) theincisors are the mid pair above being large andlaniariform; the caninesare well-developed in bothjaws. The second premo-lar above has a large, triedral, pointed crown. The first and secondmolars have two large external, and three small internal dentition of the blood-sucking Bats deviates, as might be Dentition of leaf-nosed Bat (Phyllostoma). TEETH OF DIPHYODONTS. 311
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