BY HENRY DEAJTE. 587 



Compare Cupauia serrata, Harpullia alata and Akania Hillii 

 with Xylomelum pyriforme, Lomatia ilicifolia, L, Fraseri and 

 Orites excelsa. 



On the other hand, note the differences between different leaves 

 of the same species, Akania Hillii (PI. xxxviii. bis, figs. 5-8), and 

 between the leaves of Lomatia Fraseri and L. ilicifolia, plants 

 which have such a multitude of intermediate forms that it 

 becomes difficult, if not impossible, at times to decide under 

 which species specimens are to be grouped (PL xxxviii. fo's,figs. 1-3). 



The pinna? of many of the Australian Sapindacece and the leaves 

 of some Australian Saxifrages, and the pinnae of others, corre- 

 spond to a remarkable degree with those of certain species of 

 Quercus, a fact which Ettingshausen has appai-ently overlooked. 



The leaves of Doryphora sassafras and those of the toothed 

 variety of Atherosperma moschata ( Monimiacece) are built on the 

 same plan as the toothed variety of leaves of Myrsine variabilis 

 (Myrsinacece). There is no one point in which they can be said 

 to belong to a different type. A comparison of different leaves 

 off the same plant of Myrsine variabilis affords an example of 

 remarkable specific variation (Plate xxxviii., figs. 3-4). 



As examples of leaves almost identical occurring in different 

 Natural Orders, those of Pennantia Cunninghamii {Olacineai) 

 may be compared with Villaresia Moorei (ib.), and what is still 

 more remarkable the leaves of Vitis sterculifolia and Endiandra 

 discolor {Laurineoz) show a resemblance even to the glands or 

 domatia which exist in the angles formed by the secondary veins 

 with the midrib. 



Compare also Helicia ferruginea (Proteacece) with Olearia 

 argophylla [C ompositce) in Plate xxxviii. bis, figs. 11-12. 



There are innumerable other examples of leaves of different 

 genera and orders being so much alike that it is impossible to 

 distinguish them, but the above examples are perhaps sufficient to 

 prove the fact of the existence of such similarities. While 

 searching for the affinities of fossil leaves the difficulty is generally 



