Today I came across this recital recording from a few years back. It's been awhile, so I don't remember if this movement has a title. It was the trickiest of all the movements to work out, since it's in 5, relatively fast, and polyrhythms abound throughout. In the middle, there's a fun passage that always sounded "drunk" to me, where the piano part is syncopated across the bars to sound, at least to my ears, like irregular stumbling quarter notes in 4/4 (while everyone else still plays in 5). This is interspersed with more evenly pulsed passages, but if I remember correctly the time signature never deviates from 5/8 (or was it 5/4?)
Francaix trio for flute, cello and piano