Letter | Published:

Hymenolepis nana and H. fraterna

Nature volume 113, page 675 (10 May 1924) | Download Citation



JOYEUX, in 1920, after a survey of most of the evidence, arrived at the conclusion that Hymenolepis nana of man, and H. fraterna of rodents, though apparently indistinguishable in all characters, both of the adult worm and of the egg, are yet two distinct physiological species. More recently, however, two Japanese investigators, Saeki and Uchimura, have denied the validity of the experiments described by Joyeux, and affirm that it is possible to infect mice with H. nana eggs. The original papers of these two Japanese investigators not being easily accessible, and the brief abstracts available providing little or nothing of that detailed information which is so essential in these matters, I have recently been enabled, by the kind hospitality of Dr. A. Bettencourt, to re-examine the subject.

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  1. (Helminthologist, Wellcome Bureau of Scientific Research). Instituto Bacteriologico Camara Pestana, Lisboa, April 24.

    • W. N. F. WOODLAND


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