Bird-parasites and Bird-phylogemj. 



261 



together, while group C shows a reraarkable parallelism 

 with group D. 



If I now group under the six headings indicated the 

 genera o£ Petrels from which I have parasites, the following 

 lists result : — 



I have already remarked on the degree of affinity between 

 the group of parasites, which fall into three divisions, 

 A — BCD — EF. Re-arranging the genera in these three 

 divisions,, according to the parasite groups, we have the 

 following : — 



