480 
Willis . — Plant Invasions of Nezu Zealand. 
Indo-Malaya, and there now exist on their probable tracks the islands of 
Lord Howe, Norfolk, and the Kermadecs. 
One may go on to say at once, that while these islands show great 
traces of all these invasions, they do not by any means, even if all their 
floras be added together, contain the whole of the genera, or even of the 
wides, of those invasions. In actual fact, of the genera in the above list that 
fathoms. Numbers inserted here and there give the depth in fathoms at those points. 
are marked N, W, K, NW, NW ?, NWS, NWS?, N?, NS?, WN, WN ?, 
WS, WS ?, WPS?, KW, KN, or SW, they contain 8a out of 15a, or 
54 per cent., and if the genera marked W ? be added they contain 96 out of 
a 1 9, or 44 per cent. Of the New Zealand wides of these genera 5 ° (38 per 
cent.) occur in the islands (39 Dicotyledons and ai Monocotyledons) and 81 
do not (33 and 48). One may feel inclined to say that this shows that 
transport must have been casual, but one must remember the very small 
area of these islands. Lord Howe is 7 miles long and has a maximum 
