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The nematode described in the present paper was first discovered by J. Fibiger
in the cardiac portion of the stomach of the rat. By a series of experiments he
succeeded in proving that this nematode during its evolution uses cockroaches as a
host and in the stomach of the rat is able to produce papillomatous — and in certain
cases carcinomatous growths.
Further investigation on the morphology of the nematode was made by Hj.
Ditlevsen, who defined it as a hitherto not described species of the genus Spiroptera.
Before proceeding to a description of the morphological and biologicai features of
the nematode a summary of the main points of the papers[1] previously published by
J. Fibiger will be given here:
The nematode was originally found in 3 wild rats (m. decumanus) belonging to the stock
of rats of the anatomical-pathological Institute of the University of Copenhagen and probably
imported to Denmark from Dorpat.
In these 3 rats, isolated in the same cage for a long time, the cardiac portion of the
stomach presented enormous papillomes, which in some respects were found similar to malignant
epithelial tumours.
In these stomachs the nematode was originally found by microscopical examination of
sections from the papillomatous ventral wall. Among the upper coats of the squamous-celled
epithelium sharply outlined bodies of a complicated structure were observed, containing in
several instances eggs with embryos.
In order to define these bodies as veritable sections of a nematode, a great erseries of
sections was reconstructed and the length of the nematode thus determined as nearly 1,6 cm.
the diameter being nearly 0,25 mm. Later on a few nematodes were prepared perfectly out
of the stomachs after fixation in formaline.
Now, however, the papillomes of the cardiac portion of the stomach can with
great probability be referred to the nematode. Both zoological and medical literature
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