THE FAMILIES AND GENERA OP BATS. 189 



of the others. Upper canine very small; its shaft about equal in 

 height to large premolar, strongly flattened on inner surface; its 

 posterior 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 (pm 3 ) 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 posterior 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 2 ) 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 ; m 3 with 

 three fully developed commis- 

 sures; lower molars with dis- 

 tinct entoconids. Skull (fig. 

 29) with broad, flat rostrum 



(length from frontal angle FIS ' »-*™»™»» B0 » KENS - 



scarcely greater than lachrymal breadth, but fully three times depth 

 at pm 3 ), deeply furrowed in median line, and conspicuously emargi- 

 nated in front by large narial opening. Antorbital foramen over 

 base of anterior root of pm *, the canal very short, its length scarcely 

 exceeding that of this root. Brain case very large, its length twice 

 that of rostrum; its height, including audital bullas, equal to its 

 greatest breadth, and about two-thirds its length. Base of brain case 

 bent upward. Palatal emargination extending forward to level of 

 posterior molars. Posterior opening of antorbital canal normal. 

 Audital bullae well formed, but small, covering less than half surface 

 of cochlea?. Externally much as in Natalus, with similarly funnel- 

 shaped ears and much distorted tragus (the latter noticeably trian- 

 gular), but at once recognizable by the rudimentary thumb and 

 shorter tail, which ends in interfemoral membrane a little beyond 

 middle. Muzzle and lips without warty processes, other than an 

 angular projection on upper lip at outer edge of downwardly opening 

 nostril. 

 Species examined. — Furipterus horrens (F. Cuvier). 



