In this order is only an extraordinary little Myriapod, described by Sir John Lubbock under the name of Pauropus (fig. 172). The body is only one-twentieth of an inch in length, and consists of ten somites, furnished with scattered setae. There are only nine pairs of legs, of which one pair is carried by the 3d segment, whilst the 4th, 5th, 6th, and 7th segments carry each two pairs of legs, and may therefore be regarded as really double. The head is composed of two segments, and is not provided with jaw-feet. The antennae are five-jointed, bifid, with three long multi-articulate appendages. The body is white and colourless, and there are no tracheae, so that respiration must be effected entirely by the skin. Pauropus is found amongst decaying leaves in damp situations, and species have been described both from Britain and America. It is separated from the Chilopoda by its small number of legs, the absence of foot-jaws, and the composition of the antennae out of no more than five joints.