THE FAMILIES AND GENEEA OF BATS. 



173 



Upper incisors small, in a slightly convex, continuous row, the outer 

 separated from canine by space equal to length of cutting edge of i 1 . 

 Inner incisor fully double the bulk of outer, though the two when 

 viewed from in front do not differ materially in form, their crowns 

 being low, longer than high, with nearly horizontal cutting edge. 

 Outer incisor wider relatively to its length th^n inner. Mandibular 

 incisors very small, with low, flat, rounded crowns, the outer not as 

 small as inner. They extend between canines in a slightly convex row 

 broken by minute spaces, of which the median is the most distinct. 

 Canines simple, without secondary cusps, the upper somewhat less 

 than half as long as high, with well-developed cutting edges but with 

 concave area on inner surface shallow. Lower canine slender, the 

 shaft nearly terete, the posterior basal edge produced into a distinct 

 heel. First upper premolar small, 

 scarcely equal to inner incisor, its crown 

 very low, longer than broad, with indis- 

 tinct cutting edge rising to a slight an- 

 gle anteriorly. Upper molars longer 

 than broad; protocone low and broad, 

 forming the entire shelf-like, broadly 

 rounded inner edge of tooth; paracone 

 and metacone low and long, about equal 

 in to * and to 2 , the metacone much 

 smaller in w a ; between paracone and 

 metacone a distinct though very small 

 elevation, probably the remnant of the 

 mesostyle; inner half of crown flat, 

 outer half rising at a distinct angle ; to 2 

 slightly smaller than m 1 ; to 3 more than 

 half as large as to 2 slightly smaller 

 than to 1 ; to 3 more than half as large 

 as to 2 . Lower molars long and narrow, the second somewhat more 

 than half as long as first, the third about half as large as second. 

 Crown of m 2 and to 3 flat, the central portion distinctly concave, 

 the margin without cusps ; to 1 with a similar concavity occupying pos- 

 terior two-thirds of crown, the anterior third rising into a low cusp. 

 This tooth is almost exactly similar to the posterior premolar except 

 that it is nearly twice as long. Skull (fig. 24) essentially as in the 

 less modified Glossophaginse, but rostrum deeper; zygomatic arches 

 incomplete. Base of brain case flat, showing no special peculiarities, 

 the region between pterygoids with low median ridge. Basisphenoid 

 pits barely indicated. Audital bulla? rather large, covering more than 

 half surface of cochlea?. Ears moderately large, separate. Noseleaf 

 rudimentary, the erect portion represented by a mere bluntly angular 

 projection. Tongue long and extensible, armed with incurved papil- 



FlG. 24.— Phyllonyctebis poeyi. 

 Adult female. Guanajay, Cuba. 

 No. 103585. xl*. 



