BY J. J. FLETCHER. 531 



in the Mary River in Queensland. Of a small group of earth- 

 worms characterised by the possession of a single male pore, of 

 which Cryptodrilus purpureus, Mich., from Gayndah and Peak 

 Downs, is the type, two species (including C. purpureus var.) are 

 common in the Northern River Districts, but have not yet been 

 recorded from further to the south, while a third is widely distri- 

 buted in the interior of New South Wales as far south as the 

 Murrumbidgee. 



Chirole2)tes platycephalus, recorded only from Bourke, Euroka, 

 and Dandaloo, is at present peculiar to New South Wales, but not 

 improbably it will be found to range further to the north and 

 west ; and as it seems to follow the Darling and its tributaries it 

 should also occur further to the south. Notaden extends into 

 Queensland, possibly also into Central Australia, but it has not 

 yet been reported from Victoria. Heleioporus pictus is common 

 to S. Australia, Victoria, and N. S. Wales, and not improbably 

 ranges into Queensland. 



Ilyla ewijigii var. calliscelis and H. lesueurii have become well 

 established on the Tablelands and just reach the plains at Tam- 

 worth. 



Whatever may have been the case in the past, when, as the 

 geologists affirm, the Dividing Range was much higher, at the 

 present time, except perhaps locally, the Tablelands and the 

 Cordillera can hardly be a physical barrier of an insurmountable 

 character to the migration of batrachia from one subiegion to 

 another. There is indeed evidence tending to show that charac- 

 teristic coastal species do as stragglers manage to get a footing 

 on the eastern side of the Tablelands where the conditions are 

 favourable (e.g., Mixophyes, Cryptotis, Syla jyhyllochroa, II. citro- 

 pus, and Pseudophryne aiistralis in the moist shady gullies of the 

 Blue Mts. ; Hylella hicolor at Armidale and Cryptotis at Bald 

 Nob) ; just as a few from the Plains ( Limnodynastes fletclieri and 

 Heleioporus pictus) have reached the Tableland at Guntawang or 

 at Waroo. 



A much more potent factor in regulating migration seems to 

 be climatic conditions, more particularly the amount of moisture 



