Some of the other Megascolecid peregrine forms will be referred to later. There is no doubt that the family Lumbricidae offers by far the greatest number of peregrine forms and that these are most abundant in collections from extra-European countries, where the collector has searched in cultivated lands. There are at least eight or nine species which are common in many parts of the world though their original home is undoubtedly Europe. This is a brief review of the facts, more detailed in some cases than in others. It remains to review and compare the results arrived at. The first general statement that may be made is that this faculty of extending their range beyond the limits assigned by nature is not confined to any one family. For all the chief sub-divisions of the terrestrial Oligochaeta seem to possess it, though in unequal degrees. But the inequality may be more apparent than real. For if it be recollected that the species of the family Megascolecidae are very much more numerous than those of the Eudrilidae or even the Geoscolecidae, the fact that there are more peregrine Megascolecidae will lose some of its importance. With the Lumbricidae the case seems to me to be different. Here the preponderance, not only in species (relatively speaking) but in individuals, is much above that of other families. This preponderance I should be disposed to assign to the newness of the family coupled with the vigour seen in new races. That this is a possible explanation is borne out by the fact that the 'Perichaetidae' (_i.e._ the genus _Pheretima_) is the most salient race of peregrine Megascolecidae, and it is now generally held that this group is the most modern of that enormous family. Another general statement may be made with even more confidence, viz. that it appears to be an undoubted fact that some species are more capable of extending themselves than others. Thus _Eudrilus eugeniae_ occurs everywhere on the great land masses of the globe, except in Europe; it is in fact circummundane in the tropical zone, as is also _Pontoscolex_. _Dichogaster bolavi_ is again a trifle more restricted in its range, having been recorded from tropical Africa, South America, West Indies, Madagascar, and India. Its occurrence near Hamburg in Europe is also to be noted. A little more restricted still is _Nematogenia panamaensis_ whose range is in Central America, tropical West Africa, and Ceylon. Lastly there are cases such as _Pheretima taprobanae_ which, a native of Ceylon, is also found in Madagascar.