ANNULOSA : MYRIAPODA. 



331 



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 res- 

 piration 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. 



ORDER IV. ONYCHOPHORA 

 (Grube). In the West Indies, 

 South Africa, South America, and 

 New Zealand occur examples of a 

 peculiar genus of animals, which 

 has been named Peripatus, and has 

 been at different times referred to 

 the Errant Annelides, the Leeches, 

 the Tapeworms, or the Myriapoda. 

 The species of Peripatus are terres- 

 trial in their habits, living in moist 



earth, in decayed wood, or under Fig ^^ Pauro p us Hux ieyi, view- 

 stones, active by night Only, and ed from above, and enlarged fifty 

 1,1 vi r TM diameters. (After Sir John Lub- 



completely worm-like in form. 1 he bock.) 

 cylindrical body (fig. 173) is annu- 



lated, and provided with numerous pairs of ambulatory feet, 

 which are jointed, and terminated by one or two hooked claws 

 (fig. 173, C and D), sometimes with a bunch of setae. The 

 animal walks like a caterpillar, by means of its feet, and rolls 

 up like a Millepede when alarmed. The mouth is furnished 

 with one or two pairs of horny hooked jaws. The respiratory 

 organs, as recently shown by Moseley, are in the form of trachea, 

 which open externally by numerous diffused apertures, and 

 rarely branch. From the researches of Moseley, the sexes 

 would appear to be distinct, though the animal is stated to 

 be hermaphrodite by Grube and Hutton. The ventral nerve- 

 cords are widely divergent. 



The systematic position of Peripatus must in the meanwhile 

 be regarded as doubtful, the animal presenting a type of struc- 

 ture intermediate between the Errant Annelides and the 

 Myriapoda. The presence of tracheae, however, renders it 



