-m^ 



CYNOPTERUS. 



section (the three former species) and the "' 2\'iadlus " section (the 

 three latter ; Niud'ms originally a new generic name proposed by 

 Miller for one of these species, C, jyrinceps). In the Cynopterus 

 section the surface cusp is either entirely undeveloped (40 per cent, 

 of 183 skulls) or barely traceable (44 per cent.) or perfectly 

 distinct (16 per cent.), though never quite as large as in the Niadius 

 section ; the variation as here described appears to be perfectly 

 individual ; it is quite common to find any gradation, within these 

 limits, in a series of individuals of the same species or race, taken 

 on the same spot. Only in the " JS'iadius " section are these cusps 

 constantly j^rescnt and always relatively large, though even here 

 varying considerably in size from individual to individual ; they are 

 often larger in m^ than in p^ ; in m^ a smaller supplementary cusp 

 is often present behind the principal surface cusj), or these two 

 cusps may bo fused so as to form a short longitudinal surface ridge. 

 Subjoined, tlie details from about 200 skulls representing all species 

 and races known : — 



Falate-ridges (fig. 50). — Ten (or eleven or twelve) thick and 

 rather sharply projecting, almost equidistant ridges, occupying the 



