BY R. C. ANDREWS. 565 



Sydney sandstone ; A. lanceolata, confined to sandstone patches 

 along the coastal regions as far north as Rockhampton ; A. 

 melanoxylon ^ limited to small patches of gravel and sand in north- 

 western New South Wales; while A. intermedia has a considerable 

 range in the warmer portions of extratropical Eastern Australia; 

 but this type has succeeded in establishing itself upon the light 

 clay-soils, and is, apparently, a much more recent type than A. 

 cordifolia and A. melanoxylon. 



Angophora, indeed, appears to be a type which deployed, with 

 Eucalyptus^ from the ancestors of the Metrosidereae, but which did 

 not succeed in developing protective characters to such an extent 

 as Eucalyptus did. It failed, therefore, to populate Australia, and 

 as Eucalyptus extended its borders, with the development of each 

 new protective character, so, to that extent, the less elastic type, 

 namely, Angophora, was crowded out until, at the present day, it 

 appears to be a genus rapidly undergoing extinction, and existing 

 only in outposts, as regards its former distribution. A. cordifolia 

 and A. melanoxylon are splendid examples of this contraction of 

 habitat, while A. intermedia is a striking example of the success of 

 a species which has become modified with respect to the type.* It is 

 highly probable that, in Tertiary time, Angophora had both many 

 species, and a wide distribution in warmer Eastern Australia. The 

 failure to supersede the obstinately persistent, opposite and sessile 

 leaves, except in rare instances, appears to have been one reason 

 for its extremely limited development. 



Chdmcelauciece, etc. — In dealing with Chamselaucieae, Beaufor- 

 tiese, and certain other groups of Myrtaceae, it may be advisable to 

 consider them from a general point of view. 



It will be found that, in proportion as the climatic and soil-con- 

 ditions, in which a Myrtacean genus occurs, vary from those of the 

 fertile tropics, so do the morphological characters of such genera 

 undergo a distinct change. This suggests a corresponding youth- 

 fulness for the genera considered. 



*Mr. Maiden has drawn attention to the great similarity between A. 

 intermedia and A. subvtlutina. 



