Systema Helminthum, in the third volume (two parts), represents another prodigious accomplishment of the author, the first two volumes being the treatises on the digenetic trematodes and cestodes, respectively. Volume three is a systematic treatment of the nematodes of vertebrates based primarily on their morphological, but sometimes biological, characteristics. Part one presents a classification of the parasitic nematode with brief, but pertinent, notes on their life histories and geographical distribution. Division into groups according to their host animals as fishes, amphibians, reptiles, birds, and mammals is first made with further classification by differential keys into orders, families, and genera. Further subdivisions are used when necessary. Part two gives a systematic survey of the nematode parasites of vertebrates with their host, after which some 200 pages are devoted to bibliography. Over 900 figures of parasitic structures, with accompanying legends, are presented.
This volume represents a sorely needed contribution to the literature,