ABSTRACT
The taxonomic relationships they reveal are definitely valid within the system of logic in which taxonomy operates. If the characters of a group of animal’s parasites are in accordance with these relationships—well and good, and these characters may legitimately be explained in relation to some scheme of host-parasite evolution. The host-parasite phylogenetic method cannot be denied exercise among the Primates simply because South American lice fail to do it justice. The host-parasite taxonomic method—which Metcalfcalls “the von Ihering method”—can be extended to include non-parasitic diseases as well. In any case the facts about the parasites of Primates are of interest even if they only relate slightly to the problem of the evolution of this mammalian order. Subulura, which T. W. M. Cameron described in 1930, is another genus of helminths of some interest from the point of view of the classification of the Primates.
