P. della Valle writes in the same strain: "And these two, the palankins and the andors [a kind of doli] also differ from one another, for in the andor the cane which sustains it is, as it is in the reti, straight; whereas in the palankin, for the greater convenience of the inmate, and to give more room for raising his head, the cane is arched upwards like this, _∩_..."
Source: wiktionary