. Bulletin - United States National Museum. Science. THE FAMILIES AND GENERA OF BATS. 189 of the others. Upper canine very small; its shaft about equal in height to large premolar, strongl}^ flattened on inner surface; its })osterior cutting edge with well-developed secondary cusp slightly below middle; its well-developed cingulum forming a conspicuous anterior basal cusp and a smaller posterior one. Lower canine even more reduced, closely resembling pm 3 in both size and form, except that its apex is less sharply pointed. The shaft is terete and the cingulum, though well developed, forms less
. Bulletin - United States National Museum. Science. THE FAMILIES AND GENERA OF BATS. 189 of the others. Upper canine very small; its shaft about equal in height to large premolar, strongl}^ flattened on inner surface; its })osterior cutting edge with well-developed secondary cusp slightly below middle; its well-developed cingulum forming a conspicuous anterior basal cusp and a smaller posterior one. Lower canine even more reduced, closely resembling pm 3 in both size and form, except that its apex is less sharply pointed. The shaft is terete and the cingulum, though well developed, forms less distinct basal cusps than in the upper canine. Anterior upper premolar (])/)i'') about half as high as canine, but resembling it in form even to the presence of the two cingulum cusps and the secondary cusp on posterioi- cut- ting edge. The shaft is, however, relatively lower and the small cusps are not as well developed. Posterior upper premolar, with inner cusp narrow, but high and very distinct, cingulum forming a sharp, somewhat recurved, antero-external cusp. Lower premolars alike in form, except that the anterior {pm ^) has the shaft less dis- tinctly terete than the others. It is also much shorter than the others. ]Molars normal, the protocones high and short; no trace of hypocones; ni^ with three fully developed commis- sures; lower molars with dis- tinct entoconids. Skull (fig. 29) witli broad, flat rostrum (length from frontal angle scarcely greater than lachrymal breadth, but fully three times depth at pni ^), deeply furrowed in median line, and conspicuouslv enuirgi- nated in front by large narial opening. Antorljital foramen over l)ase of anterior root of y///? *, the canal very short, its length scarcely exceeding that of this root. Brain case very large, its leng-th twice that of rostruuL; its height, including audital bulla?, equal to its greatest breadth, and about two-thirds its length. Base of brain case bent upward. Palatal emargination extending forward to
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Keywords: ., bookauthorun, bookcentury1800, bookdecade1870, booksubjectscience
