68 



front face of the upper canines is shallow or soraetiraes oltliteiafod 

 ill Pi. natidis and livwgsicmei. Pi. hihercuhit^i''; is unique in the 

 genus in having a small', but perfectly well-marked, cusp-like pro- 

 jection on posterior trenchant edge of upper canine above middle 

 of tooth (compare Pterahpe.v). 



A' 



B' 



D' 



Jig. t). — p', p^, ni', profile of left row, pulate view of right row. All figures |. 

 A, A', typical Pteropine dentition {Ft. hypcmelamu hiteus, imma- 

 ture, 78.9.14.2). B, B', heaTj dentition, strong piisterior basal 

 ledges {I't. ])selajilion,&d\i\\,^^1.2A.\). C, C, teeth short (antero- 

 posteriorly) and broad, posterior basal ledges practically obliterated 



» {Ft. nenhibernicus, immature, 86.7.9.1, type of Ft. corenia/Ka). D, D', 



degenerate dentition (Ft. svaptdafus, adult, 7.8.9.4). 



pi. — Eather larger than usual, sometimes equal to or slightly 

 laro-er than i , and with crown distinctly differentiated in Pt. pilostui, 

 leucopterus, ncnuciiensis, samoensis, anetianus, lomhocensis, and soli- 



tarius. 



p . Vnusually large in Pt. nawaiensis, scvtoeiisis, anetlamis, 



psdophoyi, jvlosug, tulermlatus, and leucopterus. This peculiarity 

 is in all of these species associated with an enlargement of i.^. 

 (Compare Pteralopex.) 



Posterior basal ledges of molariform teeth. — Species with typical 

 Pteropine dentition possess short or moderately strong posterior 

 basal ledges in p\ pS p^, and p, ; not infrequently the ledges are 

 also more or less distinctly perceptible in m' and m,. From this 

 general type the modihcations go in two opposite directions: — 



