George Rolleston, Natural History Review: a quarterly journal of biological science (1861)
“ The wave-like edge is the "operculum." Along the middle line on each in Fig. i., Fig. iii., and Fig. iv., the wave-like edge, speaking of disruption of continuity between the occipital lobes and the mass of brain anterior to them, is absent; a convolution, a, a, passes across what would else be a chasm. This convolution is the "premier pli de passage" of Gratiolet; it comes according to that authority thus to the surface, and thus bridges the chasm in Man, in the Orang, and in the Ateles, but in no other ape. ”
