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Toxocara canis larvae infecting dogs undergo tracheal migration following their ingestion in an experimental intermediate host. Development of the parasite then proceeds to the adult stage in the small intestine. Adult dogs are therefore capable of distributing fertile T. canis ova which, if ingested, could cause larva mirans in humans and other animals.This work was financed by research grants from the University of Queensland and the National Health and Medical Research Council of Australia. The writer wishes to acknowledge the encouragement and criticism of Professor J. F. A. Sprent.

Toxocara genettaesp.nov. andToxocara sprentisp.nov. from viverrid hosts in Africa and S.E. Asia respectively are described. SevenToxocaraspp. from viverrid hosts are differentiated. The writer proposes thatToxocara canarisiPuylaert, 1967, from a feline host, become aspecies inquirendaerequiring further study.

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SUMMARYAn analysis of natural infections of Toxocara mackerrasae in Rattus fuscipes trapped in rain forests in south-eastern Queensland is given and Hydromys chrysogaster is listed as a new host.T. mackerrasae larvae in egg-infected mice are incapable of somatic migration but some complete development to the young adult stage can occur entirely within the alimentary tract. T. mackerrasae is capable, in low numbers, of developing to maturity in experimentally infected Rattus spp.The work was financed by grants from the University of Queensland and the National Health and Medical Research Council of Australia. I wish to thank Professor J. F. A. Sprent for his criticisms and suggestions during the preparation of this text.