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ON SOME PAUROFODA FROM NEW SOUTH WALES. 



By Launcelot Harrison, B.Sc, John Coutts Scholar, and 



Junior Demonstrator in Zoology in the University of 



Sydney. 



(Plates Ixx.-lxxi.) 



At the end of May of this year (1914), I fii'st recognised two 

 individuals of a species of Paiiropus, while overhauling a day's col- 

 lections of Collembola, Thysanura, etc., under the microscope. On 

 revisiting the locality in which this material was collected, I was 

 easily able to find the same species in very considerable numbers, 

 as well as a second species which was much less numerous. Both 

 were found under bark Ijing upon the clay soil in forest-country 

 at Archbold's Hill, RoseviUe. During June, I collected many speci- 

 mens, some of which were kept alive in small tubes containing a 

 little damp soil and pieces of bark, while others were preserved. 

 For fixation, 1 used Carnoy's Fluid, which I subsequently found 

 to have been considered satisfactory by Kenyon(1895). In many 

 specimens fixed in this fluid, however, I found that there was a 

 tendency for the cuticle to swell up away from the muscle-layers, 

 causing considerable distortion. Believing this to be due to the 

 large proportion of acetic acid, I later tried a modification, adding 

 one per cent, of acetic acid to a mixtui'e of two parts of 95% alcohol 

 with one of chloroform. This mixture preserved the animals with- 

 out distortion, but I have not yet cut any sections, so that I cannot 

 vouch for the histological elements. Specimens fixed in hot aqueous 

 sublimate-acetic were also preserved without distortion, and this 

 fixative may prove satisfactory, as the cuticle is very delicate. 



Late in June, I found the same two species at Broken Bay, in 

 company with other species described later, which included a mem- 

 ber of the remarkable genus Eurypauropus. These were all found 

 under stones on damp ferny banks, where outcrops of shale 



