578 NOTES AND EXHIBITS. 



is 12 miles to the inch; and the vertical 4000 feet to the inch^ 

 gi^ing the vertical an exaggeration of seventeen times the 

 horizontal. Among other important features, the model shows 

 very clearly the ancient trend of the Shoalhaven and Wollondilly 

 Rivers to the north, possibly towards the old Permo-Carboniferous 

 sea; the shifting of the Divide by the Hunter and Goulburn 

 Rivers; the uniform north-west trend of the upper waters of the 

 Darling tributaries, indicating an ancient Divide running more 

 to the north-east than at present; the exceptionally curved course 

 of the Castlereagh, seen to be due to the elevation of the 

 eruptive mass of the Warrumbungles; the much greater bulk of 

 the New England Plateau as compared with the Kosciusko 

 system; and the unexplained isolation of the Lake George 

 drainage. The model will, it is hoped, be of use in connection 

 with many physiographical problems in this State. 



Dr. R. Greig Smith showed a number of lantern slides in 

 illustration of his papers. 



Mr. North sent for exhibition a specimen of a Motacilla closely 

 allied to Motacilla borealis and M. cinereicapilla of Europe. It 

 was obtained on the 10th June, 1905, at Bimbi, on the Dawson 

 River, Queensland, by the well-known collector Mr. H. G. 

 Barnard. The addition of the genus Motacilla to the Australian 

 avifauna is of considerable interest. It is somewhat remarkable, 

 however, that its single representative is not allied to M. Jlava, 

 whose range extends to Java and Timor, but to species of more 

 restricted habitats. The specimen under consideration is an 

 adult male, in perfect plumage. It has a well pronounced white 

 superciliary stripe, as is shown in Dr. R. B. Sharpe's fig. 6 of the 

 head of M. cinereicapilla * but the throat is yellow, not white ; 

 the lores and feathers below the eye are black, and a blackish 

 wash extends over the anterior portion of the ear coverts, and the 

 chin is white. On the underparts it resembles fig. 1 on the same 

 plate, M. borealis, in having the throat yellow, and a blackish 



* Cat. Bds. Brit. Mus. Vol.x. pl.vii. 



