It was the general remark made during a former expedition in the interior of New South Wales, that no absolutely entire change takes place in the vegetation east of the meridian of the new settlement named Bathurst; but that the plants of the coast were more or less frequent at a hundred and fifty miles from the sea, although in a country estimated at about two thousand feet above its level. Having to this circumstance added a remarkable and obvious sameness (arising from an extensive dispersion) of a vein of vegetation in a large tract of country, it may be inquired, how far these facts might, when applied to other parallels, identify a certain portion of the Flora of the interior, and that of the sea-coast in the same latitude; or, in other terms, how far the botany of the coast indicates the general feature of the vegetation to a certain limit, in the interior on the same parallel? Favourable opportunities were afforded me, to compare the vegetation of opposite coasts within the tropic, at the eastern and western extremes of a particular parallel; and the results of such a comparison identified many species on the two coasts. I have annexed a list of those plants that are common to the North-west and East Coasts in and about the parallel of 15 degrees South, from a contemplation of which, together with the above remarks, and a further comparison of the species with those of the shores of the Gulf of Carpentaria, through which that degree of latitude passes, might not a general idea of some portion of the Flora of the expanse of intermediate interior (far beyond the reach of actual investigation) be presumed? A few observations relative to the geographical range of certain genera and species, hitherto considerably circumscribed, will close this notice. The genus Pandanus has ever been viewed by botanists as equinoctial; nor was it till recently ascertained satisfactorily, that one of its species (P. pedunculatus, Brown) exists on the shores of Port Macquarie in New South Wales, in latitude 31 degrees South: and I have been credibly informed, that the same plant is frequent in the vicinity of Port Stephens, which is at least a degree to the southward of the above parallel. The latitude of 32 degrees South may be considered the utmost extreme of ranges from the equator of the genus in Terra Australis, on the opposite shore of which, as also in all other countries, it has not been remarked beyond the tropics.