rT|-.R0PUf5 PSELAPiroX. 303 



heavy posteriorly, coronoid ])rocebs liigli, broad (autero-posterior 

 extent), steeply ascending; coronoid height of mandible considerably 

 larger than length of lower tooth-row, c-m^; angular process heavier 

 th;in usual. 



Teeth (hg. 15 ; compare also figs. 9 B, B', p. 68, and figs. 10 B, B', 

 p. 09). — Upper incisors unusually large ; jiosterior cingulum 

 excessively strong, forming a broad ledge ; cingulum of i^ as a 

 rule visible in front view of tooth, having the ap])carance of 

 a small basal cusp on external side of i- ; the same is often the 

 case in i', though usually less distinctly. Upper canines short, 

 recurved, extremely stout: cingulum excessively broad; raised 

 margin of cingulum sometimes simple, but usually broken up 

 in a series of more or less distinctly separated, rounded tubercles. 

 Diastema c-p' small, p' rudimentary, terete, as a rule lost in 

 individuals with worn teeth. Posterior basal ledge of p^ very strong, 

 sharply marked oli" by a notch postero-extcrnally from base of outer 

 main cusp ; on postero-internal face of touth the margin of the 

 ledge is generally continuous with, rather rarely separated by an 

 obsolescent notch from, the posterior margin of the inner main 

 cusp ; antcro-internal portion of p-^ forming an indistinctly differ- 

 entiated heel, the margin of which is sometimes simple, sometimes 

 raised into one or two small rounded tubercles (cf. Ft. rodricensis). 

 Posterior ledge of p* strong, marked off from tooth by shallow 

 notch postero-externally ; antero-internal projection as in p^, but 

 smaller, m' almost twice as long as broad ; two, generally deep, 

 transverse grooves in posterior half of outer ridge, suggesting a 

 tendency of the ridge to Ijrcak up into separate tubercles, m- some- 

 what larger than m^. 



ij normal or, if anything, rather larger than usual, i^ lai-ge, 

 two and a half or three times the bulk of i^. Lower canines 

 short, recurved, stout, with excessively broad and sharply marked 

 cingulum. p^ unusually large (relatively as in Pt. samoensis and 

 aiietianns), subequal to m^, almost twice the size of i. . Posterior 

 ledge of pj, p^, and m^ very strong, forming a broad transverse 

 shelf, as a rule sharply separated by a notch postero-externally 

 from outer main cusp (in Pj generally also postero-internally, from 

 inner main cusp); antero-internal basal projection strongly differ- 

 entiated in p^, separated by a deep notch posteriorly from inner 

 main cusp (giving the inner longitudinal ridge the appearance of 

 being divided into a smaller anterior and larger posterior cusp). 

 A generally shallow, but in some individuals very well marked, 

 depression in margin of inner ridge of m^, distinctly suggesting a 

 tendency to subdivision of ridge into two tubercles (compare 

 Pi. leucopteriis) ; a similar depression sometimes faintly indicated 

 in ffijj. fflg normal. 



Palate-ridrfes. — No special modifications. Formula .5-j-o-|-.'J. 

 Arrangement as in Pt. naivaiensis (above, p. 281). 



Ears. — Short, subtriangular. half exposed. Inner margin evenly 

 convex from base to tip; outer margin flatly convex at base. 



