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frontal part and therefore does not form an operculum, then no 
formation of an ape-fissure occurs. 
6. The ape-fissure is a secondary furrow, which cannot be placed 
on the same line with the development of other sulei. 
7. The ape-fissure, under normal circumstances is formed during 
foetal life. 
8. The ape-fissure will be formed in monkeys of the same 
species nearly always at the same place. In the different monkey 
species, provided that they are not in close relation, they will be 
formed in differents places. 
