802 



HARPTIONTCTEEIS. 



wedged in between e- and pe^ (in the single skull known much 

 smaller on right than on left tooth) ; along the inner edge of the 

 tooth there are three cusps : the anterior (?') is the undivided inner 

 cusp, the posterior {pi) the postero-iuternal basal cnsp, while the 

 middle one (s) is a surface cusp arising from the crovAni near its 

 inner edge (compare development of surface cusps in Dohsonia) ; 

 the antero-internal basal ledge (a) is reduced to a mere rudiment, 

 m' is similar in structure to m', but smaller, and with scarcely any 

 trace of the cusps lettered in m' pe^, pe^, and a (but pi is relatively 

 larger, perhaps because representing in reality the fused jje and^?"). 



Fig. 79. — Harjnjioyiycteris whifeheadi, type of species. Right upper and left 

 lower tootb-row. For explanation of lettering see text. f. 



p, relatively large, about two-thirds or three-fourths the bulk 

 of p, and as high as posterior supplementary cusp of canine; 

 it has a broad inner ledge (transverse greater than longitudinal 

 diameter of tooth) and a small postero-external basal cusp (pe). 

 p has the outer and inner cusp completely fused (f + i), a small 

 anterior («) and a small postero-external basal cusp (pie) In p^ 

 the outer and inner cusps are separated at tip ; the outer cusp is by 

 a sharp but not very deep notch divided into two (e\ e^) ; similarly 

 the inner cnsp {i\ i'^) ; anterior (a) and postero-external basal cusp 

 (pe) as in p,, but larger, m^ shows three cusps along outer, and 

 three along inner edge ; the two anterior of the outer set (e\ e^) are 



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