. The families and genera of bats . Bats; Bats. 30 BULLETIN 57, UNITED STATES NATIONAL MUSEUM. m ts. incisors with crown well differentiated from root, its length greater than height or width,0 its cutting edge approximately horizontal, but with two evident notches. No striking differences in size or form between the teeth composing a series, except that the outer lower incisor is often wider than the others and with one or two blunt sup- plemental cusps posteriorly. Canines simple, the upper larger than the lower and usually the highest tooth in the entire series. Cingulum well developed, tha
. The families and genera of bats . Bats; Bats. 30 BULLETIN 57, UNITED STATES NATIONAL MUSEUM. m ts. incisors with crown well differentiated from root, its length greater than height or width,0 its cutting edge approximately horizontal, but with two evident notches. No striking differences in size or form between the teeth composing a series, except that the outer lower incisor is often wider than the others and with one or two blunt sup- plemental cusps posteriorly. Canines simple, the upper larger than the lower and usually the highest tooth in the entire series. Cingulum well developed, that of the lower tooth conspicuously oblique. Shaft subterete, that of the upper tooth flattened or slightly concave on inner side, that of lower tooth similarly flattened or concave posteriorly. The shaft of the upper tooth at base occupies almost entire crown, while that of lower appears to be situated a little in front of middle of crown so that the posterior portion Pcf\C forms a slight heel. pre Premolars except pm * essentially like the canines, though very much smaller and with height of crown not conspicu- ously greater than pIG, 4.—Typical molar teeth of an insectivorous bat. A.— length. Cmgulum Crown view of maxillary molak. B.—Crown view of y^-gll develoDed hori- f!:—KtDF. VIEW OF MAXILLARY MOLAR, -y ' zontal or slightly ob- lique. Posterior up- per premolar much larger than either of the others, its cusp nearly as high as that of canine, from which it differs hi shape in the presence of a conspicuous flange-like postero-external extension, with well-developed cutting edge and supported by a second root. Inner side of this extension flat, continuous, with flattened postero-. internal surface of cusp; crown with a slight but evident postero- internal heel; cingulum well developed, often forming an anterior cusp at base of main cusp and occasionally another on heel. The first and second upper molars resemble each other, though the second is u
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Keywords: ., bo, bookcentury1900, bookdecade1900, booksubjectbats, bookyear1907
