In a collection of vertebrate remains from the south-west coast of Madagascar, recently received in the British Museum, there occur numerous bones belonging to, at least, three species of Æpyornis. Among them are two tibio-tarsi, right and left, of gigantic size, much larger than any hitherto described. Both these bones are, unfortunately, considerably damaged at the upper end, the right one alone showing any portion of the proximal articular surface. They both, without doubt, belong to the same species, though probably not to the same individual. The left, which on the whole, is the better preserved, may be taken as the type of the species which it is proposed to call Æpyornis titan.