368 Proceedings of the Royal Physical Society. 



grooved ; and so is the last, or true molar, which is iudeed 

 more worn or flattened. 



Dentition of Female. — Incisors, W. In upper jaw, central 

 incisors a little apart, one lateral on right side nearer, unicus- 

 pidate ; central largest. In under jaw central incisors closer 

 together, rounded above, unicuspidate ; one lateral present to 

 left side, bicuspidate, smaller cusp to outside. 



Canines, \{ ; {Molars, ||) ; or Pra^molars, ^ ; Molars, 21 • 

 The first prsemolar in upper jaw is conical and projecting, 

 bicuspidate, small internal ; second, shorter, also bicuspidate, 

 with smaller internal cusp; the molar more flattened and 

 grooved longitudinally along its surface. In lower jaw the 

 first prsemolar is very small and slightly bicuspidate, with 

 small inner cusp ; the second is large and pointed, with small 

 inner cusp; the third is flattened or grooved, with small 

 inner cusp ; the first molar is grooved and flattened ; and the 

 last molar is smaller in size, flattened, and also grooved along 

 centre. Last, absent on left side. 



Dentition of Immature Male. — Incisors, ^. In upper jaw, 

 two on each side unicuspidate, lateral largest. In lower 

 jaw only one on each side present, bicuspidate, smaller cusp 

 external. Canines, ^J ; {Molars, f|) ; Premolars, ^^\ Molars, ^^^ 

 On right side of upper jaw a small pointed deciduous conical 

 or milk tooth, behind canine ; on left side this tooth also 

 present, and another still smaller pointed milk tooth between 

 first and second praemolar. In lower jaw there is also a small 

 pointed deciduous milk tooth behind canine, and behind this 

 the regular small first prsemolar ; behind it the two pointed 

 prsemolars ; a third tooth or molar is seen behind, just coming 

 above the gum. There is an additional small pointed conical 

 deciduous or milk tooth also present between the second and 

 third preemolars. 



The perfect dentition of this species of bat may therefore 

 be stated as follows : Incisors, 2^ ; Canines, ^r^ ; {Molars, -^ ; 

 or ProemoZars, II ; Molars, |^; — J|=28. Apparently in old 

 individuals the two upper central incisors only remain, the 

 others dropping out. 



