 They rejoined "Beagle" at Montevideo.As surveys were still in progress Darwin set off on another "galloping" trip in Banda Oriental to see the Uruguay River and visit the Estancia of Mr Keen near Mercedes on the Río Negro.On 25 November he "heard of some giants bones, which as usual turned out to be those of the Megatherium" but could only extract a few broken fragments, then on the next day visited a nearby house and bought for about two shillings "a head of a Megatherium which must have been when found quite perfect", though the teeth had since been broken and the lower jaw had been lost.