The development of the rhinencephalon varies among species. In humans it is rudimentary. A small area where the frontal lobe meets the temporal lobe and the area of cortex on the uncus of the parahipocampal gyrus (both belonging to the olfactory cortex) have a different structure (so called "allocortex") than most of the telencephalon and are phylogenetically older (so called paleocortex).
^Terence R. Anthoney (1994). Neuroanatomy and the neurologic exam: a thesaurus of synonyms, similar-sounding non-synonyms, and terms of variable meaning. Boca Raton: CRC Press. p. 311. ISBN0-8493-8631-4.