Having completed the survey of the central and southern land masses of the globe we next direct attention to the northern land masses, viz. North and Central America on the one hand, and Europe and northern Asia on the other. With regard to America we find besides many species of Lumbricidae the genera _Notiodrilus_, _Microscolex_ among the Acanthodrilinae, _Megascolides_ and _Plutellus_ of the Megascolecinae, no member at all of the Octochaetinae, a considerable number of species of _Ocnerodrilus_ and sub-genera belonging to the Ocnerodrilinae, a good many species of _Dichogaster_ and at least one of _Trigaster_ among the Trigastrinae, while one sub-family, that of the Diplocardiinae, is only found here and contains two genera _Diplocardia_ and _Zapotecia_ with quite ten species between them of which only one belongs to the last-named genus. There are no Geoscolecids (except the chiefly aquatic _Sparganophilus_); this family stops short in the West Indies where their presence has been briefly referred to in considering the worms of South America. The vast majority of the genera enumerated here are only found in the warmer parts of the North American continent. We have therefore in this division of the world some nine genera of which at least one, viz. _Diplocardia_ (and its close ally, hardly perhaps to be separated, _Zapotecia_), is confined to it, while _Trigaster_ only extends as far south as to the West Indies. Europe and northern Asia, of which Europe alone and certain limited tracts of Asia are at all known, contain all the genera of the family Lumbricidae which are (according to Michaelsen) _Eiseniella_, _Eisenia_, _Helodrilus_, _Octolasium_, _Lumbricus_ with various sub-genera of _Helodrilus_, such as _Dendrobaena_ and _Allolobophora_. Besides these forms, which amount to at least 130 species, we find the genus _Hormogaster_, with two species, the only genus of the Geoscolecid sub-family Hormogastrinae; there is also a species apiece of the genera _Criodrilus_ and _Sparganophilus_ (sub-family Criodrilinae). But as these are at least largely aquatic they come under another set of rules and are not important in the present survey of the earthworms of the world. It will be thus seen that with these two last exceptions the area in question contains but six genera of which _all_ are peculiar.