. The families and genera of bats . Bats; Bats. 48 BULLETIN 57, UNITED STATES NATIONAL MUSEUM. Characters.—Dental formula : 3. 1. -2345-- -2-2 1-1 1 2 -. 1. -2 3 4 5 6 2-2' 1-1 pm m 1-1 3-3 3_3' "' 2-2 = Teeth without special modifications. Upper incisors in contact with each other, but separated from canine by wide diastema, nearly terete, their crowns slightly flattened antero-posteriorly, the inner tooth of each pair slightly longer than the outer. Lower incisors somewhat flattened laterally, the outer of each pair slightly the larger; cutting edge blunt, nearly flat, though di
. The families and genera of bats . Bats; Bats. 48 BULLETIN 57, UNITED STATES NATIONAL MUSEUM. Characters.—Dental formula : 3. 1. -2345-- -2-2 1-1 1 2 -. 1. -2 3 4 5 6 2-2' 1-1 pm m 1-1 3-3 3_3' "' 2-2 = Teeth without special modifications. Upper incisors in contact with each other, but separated from canine by wide diastema, nearly terete, their crowns slightly flattened antero-posteriorly, the inner tooth of each pair slightly longer than the outer. Lower incisors somewhat flattened laterally, the outer of each pair slightly the larger; cutting edge blunt, nearly flat, though divided by a shallow notch into two in- conspicuous lobes. Canines both above and below with a secondary cusp on inner side formed by a slight prolonga- tion of the cingulum and some- what variable in its develop- ment in different species. An- terior upper premolar perma- nent, but scarcely larger than incisor in cross section and so short as barely to penetrate the gum. Its crown is nearly flat, though with a faintly in- dicated antero-external cusp. The corresponding lower tooth is considerably larger, its disk- shaped crown somewhat con- cave except for the minute antero - external cusp. The three suceeding cheek teeth almost exactly resemble each other above and below; pm z and pm 3 are higher and shorter than the others, and the inner ridge tends to form a blunt cusp opposite base of main cusp; pmi,m1, pm±, and w^ have the longitudinal furrow well de- ' veloped and bounded on the inner side by a distinct, though low, ridge, and on the outer side by a much higher ridge, which rises anteriorly into a blunt cusp. Their crowns are noticeably longer than broad. The sec- ond lower molar closely resembles the anterior lower premolar, except that it lacks the small antero-internal cusp. The skull (figs. 5,6) very primitive in form, the ventral profile nearly straight, the dorsal pro- file showing no special peculiarities. Floor of brain case scarcely. Please note that these imag
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Keywords: ., bo, bookcentury1900, bookdecade1900, booksubjectbats, bookyear1907
