. Catalogue of the mammals of western Europe (Europe exclusive of Russia) in the collection of the British Museum. CHIROPTERA. forming true basal cusps. Mandibular canine low and heavy, its apex scarcely rising above level of highest molar cusps, its greatest diameter measured along cingulum nearly or quite equal to length of anterior border of shaft; cingulum well developed, foi'ming a distinct antero-basal cusp, the apex of which rises to level of middle of posterior border of shaft. Anterior upper premolar with area of crown approximately equal to that of upper incisor and about one-hfth th
. Catalogue of the mammals of western Europe (Europe exclusive of Russia) in the collection of the British Museum. CHIROPTERA. forming true basal cusps. Mandibular canine low and heavy, its apex scarcely rising above level of highest molar cusps, its greatest diameter measured along cingulum nearly or quite equal to length of anterior border of shaft; cingulum well developed, foi'ming a distinct antero-basal cusp, the apex of which rises to level of middle of posterior border of shaft. Anterior upper premolar with area of crown approximately equal to that of upper incisor and about one-hfth that of canine. It is somewhat crowded inward from tooth-row, though about half of its crown is visible from outer side in space between canine and large premolar ; main cusp short but well developed, lying somewhat in front of middle of crown, the general form of the tooth much like that of canine but proportionally lower. Large upper premolar with crown area about equal to that of canine or slightly greater, the inner portion narrow and flattened-concave, with evident elevated rim, the posterior border strongly concave, the anterior border usually convex ' but occasionally a little concave ; height of main cusp slightly greater than that of highest Fig. 35. molar cusps and about equal to length of AnterioTteeth X 5"* tooth along outer cingulum, posterior cutting edge AVell developed ; secondary cusp low but evident, rising from cingulum at antero-internal base of main cusp. Lower premolars with crown areas not conspicuously unequal, though that of second perceptibly greater than that of first; outline of crown of each tooth rhombic, the outer border somewhat convex, the anterior border of second relatively shorter than that of first ; cingulum well developed, forming a slight antero-internal basal cusp ; main cusp triangular in outline when viewed from the side, that of second as high as molar cusps, that of first shorter, the antero-external surface of each tooth convex,
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Keywords: ., bookcentury1900, bookcollectionbiod, bookdecade1910, bookyear1912
