lakes about Lake Gardner were conjoined, such extension of the 

 inland waters must liave hirgely operated in checking migration 

 from west to east or vice versd. The only way of intercourse 

 then would have been in more northern latitudes which are 

 beyond the latitudinal distribution of the related species in the 

 two extreme regions. It seems probable that the isolation of 

 tlie A^itoclithonian flora antedates the period of deposition of the 

 Cretaceous rocks, which occupy so vast an area in Central Aus- 

 tralia, and that the Eremian flora was introduced in compara- 

 tively recent times. 



In the \'olumes of the Flora Australiensis are recorded many 

 species from the Lake Eyre basin, chiefly based on the collection!^ 

 made by Babbage, Burke and Wills expedition, the Victorian 

 expedition (in search of Burke and AVills), and by Lewis. In 

 most cases topographic definition has not been given, and where- 

 ever possible they have been replaced by me in the accompany- 

 ing list by exact localities. 



The collections of plants upon which the bulk of the species is- 

 ]3ased I owe to the following gentlemen : — 



To Mr. J. C. Chandler a small collection gathered in the neigh- 

 bourhood of Peake and received in 1882. 



To Mr. James McLeod for a large collection made at Innam- 

 inka, the site of Burke's grave, eleven miles west of the Queens- 

 land boundary, received August, 1884 ; a second collection by 

 the same made in the autumn of the following year along the 

 stock road from Innaminka by the Strzelecki to Lake Frome. 



To Mr. Malcolm Murray for a choice collection gathered by 

 him early in 1885 on the south and west sides of Lake Eyre, 

 l^etween Callana and Anna Creek. 



To Mr. E. G. Millard for many species collected by him in the 

 spring of 1886 at Kalamurina Station, on the Warburton River 

 (or Lower Diamantina), 30 miles south-east of Cowarie. 



I have also examined a collection made by Dr. Cleland in 

 1886 on a journey from Hergott to Strangways ; and also one 

 collected at Tingatingana Station, on the Strzelecki Creek, 

 about midway between Innaminka and Lake Frome. 



Lastly, I visited the country about Callana during the winter 

 of the present year. 



The sign [1] which is aflixed to localities indicates that I have 

 examined authentic specimens, and that the specific determina- 

 tions are mine. 



The list contains the names of 388 species, less than half of 

 the known species in the extratropical part of the South Aus- 

 tralian portion of the Eremian region ; but it is almost certain 

 that some common plants are not included, and a very slight ex- 

 tension of the assumed southern boundary would largely add to 



