616 ON SOME PAUROPODA FROM N. S. AVALES, 



occurred among the sandstone. I was not successful in finding any 

 on the sandstone-soil, which would not seem to retain suthcient 

 moisture to afford a suitable habitat for these delicate little 

 myriapods. 



Pauropus is an active little creature; easily distmguished by the 

 unaided eye from the lipurid Collembola^ the only things with 

 which it might otherwise be confused, by its markedly narrow an- 

 terior end, rapid movements, and rigid body, which is only rarely 

 flexed from side to side. From observation of those which I have in 

 captivity, I am quite confident that they are humus-feeders, as has 

 already been surmised ; for I have frequently watched them, under 

 the microscope, browsmg upon particles of soil on which I could 

 distinguished nothing definite in the way of food. Those in cap- 

 tivity laid eggs rather freely, some of which I allowed to hatch 

 out, while the majority were preserved. I hope to be able to obtain 

 sufficient material to ascertain something of the embryology of the 

 Order, which is unknown; but as, even if sufficient material be 

 forthcoming, I shall not have the opportunity, for some time to 

 come, of working at it, I have thought it advisable to publish 

 descriptions of the forms found, of the post-embryonic stages, and 

 some discussion of the segmentation. 



The morphology of the adult forms has been well studied by 

 Schmidt (1895), and Kenyon(1895). Of the post-embryonic stages 

 I have very plentiful material, but I prefer to defer an account of 

 the minute structure of these until such time as I am also able to 

 give an account of the embryonic stages. 



Pauropoda have hitherto been recorded only from Europe, the 

 United States, Argentine, Chili, and Siam. The Australian species 

 appear to show affinities to the South American rather than to the 

 Asiatic forms. 



Order PAUROPODA Lubbock. 



Family Pauropodid^e Lubbock. 



Genus Pauropus Lubbock. 



Hansen (1901, p. 349) gives the following diagnosis for the 



genus: — "The lower antennal branch has the anterior margin at 



