MYRTACEAE. With respect to that portion of Myrtaceae, lately discovered upon the north-western shores of Australia, and which are alone worthy of remark here, it is to be observed, that, considering the many points of that coast visited during the progress of the relative voyages, the number of species observed are comparatively few, for, including Eucalyptus, it does not exceed sixteen plants. Of Eucalyptus itself, only seven species were detected on those shores, and these, for the most part, form small trees, more approaching the average dimensions of all their congeners in the colony of Port Jackson. Melaleuca is limited to three species, one of which was originally discovered by the celebrated navigator, Dampier, on the West Coast, where Beaufortia has been recently seen. Four species of Tristania, their related genus, were gathered in about latitude 15 degrees South, where also an Eugenia, bearing fruit, was observed; but of Leptospermum, or Baeckea, genera chiefly belonging to the higher latitudes of New Holland, no species appeared throughout the whole extent of coast examined. RHAMNEAE and CELASTRINAE were formerly united among the Rhamni of Jussieu, but disposed in sections, differing from each other in the position of the stamina, with relation to the petals, and in the character of the fruit; which, when viewed with other important differences of fructification, induced Mr. Brown to modify and define them as distinct orders. In the Herbarium of the voyages, there are a few plants belonging to Rhamnus, Ziziphus, Ceanothus, or Pomaderris, and Celastrus, but both families prove to be comparatively rare in the intratropical parts of Terra Australis, beyond which Cryptandra seems only to exist. Upon the north-western shores, a species of Ziziphus (common to the East and North Coasts) forms a tree of large dimensions, where also an undescribed Celastrus has been discovered. Since Pomaderris evidently increases from the verge of the tropic southerly towards the parallel of Port Jackson, where its maximum exists, and as it is frequent on the South Coast, it is highly probable the West Coast is not wanting of the genus, particularly as traces of it were found on Dirk Hartog's Island. LEGUMINOSEAE. There are upwards of one hundred and forty species of this extensive natural class in the Herbarium recently formed, which bear a proportion to the aggregate of the entire collections of about one to nine.