. Bulletin - United States National Museum. Science. 30 BULLETIN 57, UNITED STATES NATIONAL MUSEUM. incisors "with crown well dift'erentiated from root, its length greater than height or width," 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 dev
. Bulletin - United States National Museum. Science. 30 BULLETIN 57, UNITED STATES NATIONAL MUSEUM. incisors "with crown well dift'erentiated from root, its length greater than height or width," 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 tootli al Ijase ()ccuj)ies almost entire crown, wiiile that of lower appears to be situated a little in front of middle of crown so that the posterior portion VIC p re m Is. Fig. 4.—Typical molar tketh of an insectivorous bat. .1.— Crown view of maxillary molar. J?.—Crown view of MANDIBULAR MOLAR. C—SIDE VIEW OF MAXILLARY MOLAR. ecd.—ENTOCONID. Ac.—HYPOCONE. Accf.—HYPOCONID. mc.—M ETA CONE. mC(f.—METACONID. ms.—MESOSTYLE. ?ft<S.—METASTYLE. pC—PARACONE. JKd.—PARACONID. pre.—PROTOCONE. JWCd.—PROTOCONID. pS.—PARASTYLE. forms a slight heel. Premolars except pi// ' essentially like the canines, though very nnich smaller and with height of crown not conspicu- ously greater than length. Cingulum well developed, hori- zontal or slightly ob- licpie. Posterior up- per premolar much larger than either of ^ the others, its cusp nearly as high as that of canine, from Avhich it differs in shape in the i^resence of a conspicuous flange-like postero-external extension, with well-develo})ed cutting edge and supported by a second root. Inner side of this extension Hat, continuous, with flattened postero- internal surface of cusj); crown
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Keywords: ., bookauthorun, bookcentury1800, bookdecade1870, booksubjectscience
